De Gea has singled out the big Swede for special praise after spending some time with the striker on their pre-season tour, but also had words of praise for the club's other new signings, Eric Bailly and Henrikh Mkhitaryan.
"It's really good to have Zlatan already here, training with the team," the Spain international told MUTV. "You can see he's a top player, he's massive, very big, with a lot of quality and of course he is a top striker.
"I think he will settle in very quickly. You can look and it seems like he has been playing here many years already and the same with the other guys we've signed [Eric Bailly, Henrikh Mkhitaryan].
"They are playing really well, their training has been top and I think that we have signed really good players."
When asked if the three new arrivals had led to a boost in morale, he added: "Yeah that gives us more energy when you see players like them coming to Manchester and now we have to train all together, trying to be fit as soon as possible and now we're going to play the first game against Leicester City with the Community Shield up for grabs."