The Mirror says City are tracking England's No.3 keeper at Euro 2012, Butland.
The 19-year-old is on Birmingham City's books, although he has never played for them, spending much of last season on loan at League Two Cheltenham.
Hart is clearly the Premier League Champions' No.1 for years to come, but the ambitious outfit want to get an heir apparent in their squad as soon as possible.
Cash-strapped Birmingham are likely to sell Butland this summer and City are at the front of the queue. Arsenal and Tottenham have also expressed an interest.