​Borussia Dortmund's Neven Subotic is a transfer target for Bundesliga rivals Hamburg, according to reports in Germany.

The centre-back is believed to be interested in a possible summer switch to Hamburg after Subotic's agent, Freider Gamm, told the ​Hamburger Morgenpost newspaper that his client has tonnes of respect for Die Rothosen's head coach Markus Gisdol.

Subotic has spent the second half of the 2016/17 season on loan at another German top flight outfit in the form of FC Koln, and his future at the Westfalenstadion nows looks even more uncertain following the comments from Gamm.

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He said: "Of course, the HSV is exciting. Subotic has a very high opinion of the coach (Gisdol)."

Hamburg were linked with a January move for Subotic after the 28-year-old successfully completed his rehabilitation of a knee problem that needed to be rectified by surgery.

However HSV, as well as Premier League side Middlesbrough, decided against bringing him to the club as Subotic battled to regain full match fitness after his lengthy lay-off, and the former Mainz star opted to complete a temporary switch to Koln instead.

Gisdol, who opted to bring in Kyriakos Papadopolous on loan from Bayer Leverkusen instead, is on the hunt for defensive reinforcements in the summer as concerns grow over his centre-back contingent. Papadopolous is expected to return to Leverkusen and not be sold by the German outfit in the close season, while Switzerland international Johann Djourou is free to leave the Volksparkstadion on a free when his contract expires on 1st July.

Gisdol, therefore, is keen to recruit defenders to his cause, and that desire could lead to him reigniting his longstanding interest in Subotic when the transfer window re-opens in just over a month's time.

Subotic, who has 36 caps for the senior Serbian national team, made 12 appearances for Koln - nine of them starts - during his five-month loan spell at the RheinEnergieStadion as he finally overcame his 18-month injury nightmare. The Dortmund player has featured 258 times for Thomas Tuchel's side during his nine-year career with his parent club, and has lifted five titles during that time.

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