That would be one really pathetic way to try and minimise his contribution to them.
If you weren't desperately trying to belittle him as a player though, you might say something like:
Sunderland have won 10 of their 11 points in games he's played in.
In games he's started they've conceded 5 goals in 5 games. In the 9 he didn't start they conceded 18 goals.
The Sunderland fans are raving about him, and he's an integral player for them moving forward. I have absolutely no idea why any City fan would twist facts in such a way as to shit on one of out own players the way you have with Denayer - what's your problem with him? No objective outsider, let alone a City fan would try and paint the completely inaccurate picture of him being useless - this on top of you opening with the lie that "he can't even get in the Sunderland team" - so clearly there's something more to it.