Barca maintained its perfect pre-season record, making it three wins from three at Mercedes-Benz Arena.

Depay, who joined the La Liga giant on a free transfer in June after his departure from Lyon, opened the scoring against the Bundesliga outfit in emphatic fashion after 21 minutes.

The Dutchman controlled Frenkie de Jong’s diagonal ball into the box, before flicking it over the head of defender Pascal Stenzel and firing past Fabian Bredlow in the Stuttgart goal.

After his second goal in as many games, Depay then played a key role as Barca doubled the lead 15 minutes later – a clever backheel releasing Griezmann to cross for youngster Yusuf Demir to tap home.

Koeman praised the impact of his compatriot and was particularly impressed by his link-up with the France star.

"Surely people know what Memphis is about," he said.

"He has been at [Manchester] United, the last few years at Lyon and above all, he has shown himself to be a goalscorer.

"He showed [that quality] with his goal, strength and speed he brings to the team.

"His connection with Antoine is very good and that gives us a lot.

"They are two players who can play in different positions in the attack. We're going to have competition."