Bolton striker Heidar Helguson has been touted along with Derby County's Stephen Pearson and Fulham midfielder Jimmy Bullard, who has returned to the Cottagers first team after injury.
Helguson has played for Watford,whilst Jimmy Bullard will be remembered for a superb performance for Wigan against the Sky Blues at Highfield Road.
City boss Chris Coleman has yet to announce which players he wants to keep for next season.