The transfer window does not officially open until July 1, but rumours and speculation are already rife about potential incomings at the John Smith's Stadium.

This will be Chris Powell's first summer in the Town hotseat and he could look to add some tried and trusted players to his squad for the 2015/2016 campaign.

The Terriers boss has revealed he is looking to bring in two or three key signings to improve his squad as he looks to put his stamp on the team ahead of next term.

Whether it's powerful strikers, jet-heeled wingers, seasoned defenders or leaders Powell is looking for in the close season, there are plenty on the market who have played under him before.

And below we take a look at some of the faces from his past who could have something to offer at the John Smith's.

Paul Gallagher - Leicester City

The frontman is on loan at Preston North End from the Foxes and has played an integral part in their march to the League One play-off final.

Gallagher was part of the Leicester side in 2010/2011 which finished 10th under three managerial regimes, with Powell taking the reins on a caretaker basis in between Paulo Sousa's exit and Sven-Goran Eriksson's appointment.

Much will hinge on how Preston fare in their Wembley showpiece against Swindon Town but, should Simon Grayson's team fail to secure promotion, Gallagher could be an option this summer as the Scot's contract is due to expire.

Lloyd Dyer - Watford

The Hornets snapped up the former Leicester wideman last summer on a free transfer but he was unable to make an impression at Vicarage Road and was quickly shipped out to Birmingham City.

He showed flashes of what he can offer while on loan at St Andrew's but only scored once in 18 league outings with Gary Rowett's men.

A winger may not be high on the shopping list for Powell given his defensive concerns, but could he be tempted to move for the 32-year-old?

Liam Moore - Leicester City

Powell has made no secret of his desire to bolster a backline which shipped some 75 goals in 2014/2015 and in Moore, who Powell will know well from his time at Leicester, there is a talented youngster who may be ushered out on loan once more next year.

A temporary spell with Brentford did not work out for Moore last season but the classy central defender quality is clear and he has been linked with Arsenal regularly since breaking through at the King Power Stadium.

There would almost certainly be fierce competition to overcome to land him, but he fits the bill.

Ben Hamer - Leicester City

Leicester City goalkeeper Ben Hamer

With rumours of Joe Murphy possibly set for an exit this summer, goalkeepers could be on the agenda for Powell as he looks to shape his first-team squad for next season and Hamer represents an ideal candidate for any potential vacancy.

He made 41 league appearances under Powell at Charlton in the Addicks' 2011/2012 promotion campaign from League One - when Town were also promoted.

And Hamer repeated the feat in the Championship a year later as well as making 37 in 2013/2014, so he was very much a key member of the success Town's chief experienced at the Valley.

Johnnie Jackson - Charlton Athletic

This may be a slightly ambitious target given his standing with the Addicks, but there have been whispers of a prospective move for the former Tottenham Hotspur ever since Powell arrived at Town.

He would certainly bring the experience and battle-hardened qualities the manager is looking for to make this team better equipped for another gruelling Championship season.

It would not be easy to prise him away from Guy Luzon's men, but he has often had to play second fiddle to Jordan Cousins and Yoni Buyens at the heart of midfield in the last few months and a fresh challenge.

Michael Morrison - Birmingham City

The 27-year-old found himself out of favour at Charlton, where he excelled under Powell's guidance, and secured a loan move to Birmingham City back in October.

That temporary switch was converted into a permanent move in January and he has repaid Gary Rowett's faith by delivering a series of commanding defensive performances.

Rumours have emerged over the last few weeks of Powell swooping for his former player but Rowett has refuted the prospect of him leaving and it remains to be seen whether a deal can be struck for such a key figure at St Andrew's.

Lawrie Wilson - Free agent

Lawrie Wilson has been linked with a move to Huddersfield Town

Another former Powell disciple who has been linked with a move to the John Smith's Stadium since the end of the season and one that is certainly accessible having recently been released.

The 27-year-old spent time on loan at Rotherham United last season after falling from favour under Luzon but his time at the New York Stadium yielded just three appearances.

He would represent a relatively risk-free addition but whether or not he would be able to make a tangible impact on the first team is very much up for debate.

Rhoys Wiggins - Charlton Athletic

While Wilson would be able to cover numerous positions due to his versatility another Addicks old boy for Powell in Wiggins would solve the problem position at left-back.

Reece James has returned to Manchester United and, while he will certainly be a viable candidate to rejoin the Terriers next season and provided the left-sided balance once more, Wiggins could offer a longer-term option.

The emergence of Morgan Fox in SE7 has led to claims that Luzon may be prepared to countenance the sale of Wiggins this summer and Town should be at the head of any queue for his signature.

Bradley Wright-Phillips - New York Red Bulls

Bradley Wright-Phillips has scored freely in the MLS

Okay, we'll admit it, the chances of Wright-Phillips trading the glitz and glam of the Big Apple for life back on these shores is slim, but how Powell would love to get his hands on a goal-getter who has scored for fun in the MLS.

Wright-Phillips top-scored in 2011/2012 under Powell and a tally of 27 goals in his first full season with the Red Bulls alongside the legendary Thierry Henry in attack showed he still knows where the goal is.

That haul equalled an MLS single-season record and, with Henry retired, he is the focal point of the attack at the Red Bull Arena. We can dream...

Dorian Dervite - Bolton Wanderers

The Frenchman was a key component of Powell's 2012/2013 and 2013/2014 sides in the Championship and played at this level once more last season with Neil Lennon's side.

He did not enjoy the most successful season last term, with the Whites shipping 67 goals but Powell would surely be confident of extracting the sort of form he showed in his time at Charlton.

Plus, he would come with something of an added bonus of providing competition in central defence without necessarily commanding an automatic place in the starting XI.

Marvin Sordell - Burnley

Was at Charlton on loan during 2013/2014 at the same time as Powell but, having moved to Burnley from then parent club Bolton Wanderers last summer, the 24-year-old has been forced to accept a bit-part role.

He is yet to score for the relegated Clarets, who will face Town once more next season after their relegation from the top flight.

But there has been speculation in the past about a possible swap deal involving James Vaughan and Powell might look to revisit the idea of bringing in Sordell, at least, and getting him firing once again.