The 25-year-old is currently on-loan at Leicester City and the Championship side are reportedly keen to make the move permanent.
Leicester boss Sven-Goran Eriksson said: “Curtis has not made up his mind what he wants to do but we want to keep him.
“He has Leicester as one option and doesn’t quite know what he has in the other hand. But, if a big Premier League club comes in, it will be difficult for us to compete.”
Wolves, Everton and Stoke City are also keen on signing the defender.
