"I'm over the moon. I can't ask for much more. The manager has given me time on the pitch and I'm repaying him with my performances," BBC Sport quotes him as saying.
"We've got fighters in the dressing room. We've got determination and grit and that's why we're doing well lately. Hopefully, this will give us a boost. We're out of the relegation zone and we'll keep fighting to stay there."
Wickham has scored five goals in his last three games for Sunderland.