Gundogan also stated that the Armenia international may struggled to find his feet in the early days at United as he adapts to Premier League football.
“He has been at Dortmund for three years. The first two years were not so easy for him, to be honest. He’s a player who needs self-confidence, who needs to play every time and prove himself to get better and better,” Gundogan was quoted as saying by the Guardian.
“At this time we (Dortmund) were not so successful, so it was not easy for him to adapt. He had a few problems.”
“But when you see how he played last year, it was really incredible. Maybe he was the most important player for us last year. If he can go on like this, he will have a big impact Manchester United and a big plus. It’s difficult for us to beat them, of course, but I wish him the best and to stay healthy.”
Gundogan initially joined Dortmund from Nuremberg in 2011 under the stewardship of Klopp and helped the Bundesliga giants reach the 2013 Champions League final.
The Germany international has been ruled out for the opening weeks of the Premier League with an injury. Gundogan dislocated his knee during training with Dortmund, the injury which almost cost him a move to City.
Gundogan provided seven assists and three goals in 40 appearances for Dortmund last season.