The arrival of Berbatov, Sidwell suggests, was an important sign of intent from Martin Jol's side.
Sidwell told the Daily Mail: "The players that we lost - Clint, who was our top goal-scorer, then Mousa as well, who was one of the best players I've played with over the years - (meant) we needed to get somebody in who was going to be a good buy and Berbatov has turned out to be that so far.
"Glimpses of what he does in training and stuff - he's just brilliant. And you're seeing that on the pitch as well.
"He's very happy-go-lucky, very easy. Nothing seems to faze him. That's how he plays, doesn't he? Some people don't like that that particular style but when he's producing what he's doing at the minute, you just applaud it.
"When he first came he was really quiet - but I think that's his personality and persona. He's started to come out of his shell and he's quite dry, really. He comes out with a few one-liners every now and again."