Rosler revealed he challenged Saville to score more goals - and the on-loan Chelsea youngster responded with a 25-yard screamer to sink Colchester
He said: "What I wanted to see from him was more of a goal threat and we saw that in terms of running into the box, attacking the cross, shooting from outside the box.
"George started the season well, dropped in his performance, then got injured. Now he has come back, we have eased him into games and I thought it was the right game for him."
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