Houghton has also signed a new Chelsea contract until 2018. The 21-year-old, who has won the FA Youth Cup with the Blues, has been a regular for Doncaster throughout this season as the Yorkshire club has maintained a challenge at the top of the League Two table.

Blackman (pictured below), who is 23, has also featured frequently for his loan club Wycombe, and has been prominent as the Chairboys climbed up the division into a top-six place.