Clayton Donaldson has signed a contract extension with Birmingham City, keeping him at the club until 2018.

The 31-year-old striker, who scored 16 goals last season, signed on a two-year contract from Brentford last summer.

Although the forward still had one year to run on his initial deal, his new contract will keep him at St Andrew's for a further two seasons.

Demarai Gray also recently committed his future to the club, signing a three-year contract extension.