Shotton spent the first half of last season on loan at Wigan and he did not feature for Stoke after returning to the Britannia Stadium in January.
News of Shotton's possible availability this summer has alerted a number of Premier League and Championship clubs.
Shotton is a product of Stoke's academy system and has played 70 first-team games for the Potters.
The 25-year-old's versatility in that he can play in defence and midfield makes him an attractive proposition for his suitors as they look to bolster their squad options.
Need to cut the wage bill fast before Stoke City end up down the QPR route.- dannyjohnson