Sky Sports understands Charlton face a battle to hang on to star defender Michael Morrison this summer.
Morrison has been one of Charlton's shining lights this season and he is out of contract at the end of the season.
Charlton are yet to tie down Morrison to a new deal and a number of clubs are monitoring his contract situation.
The 26-year-old is regarded as one of the best defenders outside the Premier League, having made over 300 league appearances already in his career.
Morrison, who has only missed three league games since 2011, has played a key role in helping the club climb out of the bottom three in the Championship in recent weeks with the Addicks keeping five clean sheets in their last ten games.
Charlton are expected to offer Morrison a new deal, but they may struggle to match offers from elsewhere as his suitors look to lure him away from The Valley.