The Manchester United striker was on hand to congratulate Triple G following his impressive victory over Sheffield-born Brook at the O2 in London.
Zlatan Ibrahimovic didn't seem downhearted following defeat in Saturday's Manchester derby, travelling to London to see Gennady Golovkin's middleweight boxing victory over Kell Brook.
The Swede was unable to deal archrival Manchester City a killer blow during the Red Devils 2-1 loss, though did pull one back by capitalizing on a mistake from Caludio Bravo in the first half.
But the former Paris Saint-Germain striker was on hand to congratulate Triple G in London, following fracturing Brook's eye socket and retaining his belts.