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Southampton manager Ronald Koeman has admitted Manchester United target Nathaniel Clyne could leave the club in the summer.

Clyne, 24, is out of contract in 2016 and United are determined to sign an out-and-out right-back in the summer, with Rafael da Silva expected to leave the club.

England international Clyne rejected United to join Southampton in 2012 to pursue first-team football and he has developed into one of the Premier League's most impressive full-backs.

And Koeman has acknowledged it might be difficult to retain the former Crystal Palace defender.

"We are still trying to keep Clyne in the club. We know it's not easy as maybe there is some interest," Koeman said.

"At the moment, there is not a serious bid for whichever player in the team, but we'll do everything to keep them."

Louis van Gaal has settled on Antonio Valencia as United's interim right-back after the Ecuadorian signed a new contract last summer.

See which players United fans want the club to sign below