Wigan Athletic boss Roberto Martinez admits they need to find a replacement for new Sunderland signing Lee Cattermole.

He said: "The transfer market changes every hour at this time of the year, and that brings with it instability because you never know what is around the corner.

"You can get injuries, and you don't know if you are going to lose players as in this case, but the boys are focused and I've got huge confidence in the quality of the squad."