Skysports.com understands Norwich and Southampton have made moves to sign Charlton's Nicky Bailey.
Several other Championship and Premier League clubs are monitoring the situation, including West Brom, Middlesbrough and Nottingham Forest.
The Addicks skipper is hot property after netting 12 League One goals last term to fire his side into the play-offs.
However, he then endured the agony of missing the crucial penalty as the Addicks suffered their heartbreaking semi-final shoot-out defeat to Swindon.
While Charlton boss Phil Parkinson has previously stated he will fight hard to keep hold of his best players, the failure to reach the Championship will undoubtedly increase the pressure on keeping his squad intact.