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Puig, 21, has been linked with a move from Barca, and played no part in Sunday's (AEST) 1-0 Joan Gamper Trophy win over Elche at Camp Nou.

Koeman said while Puig was part of his plans, the midfielder should look for short-term opportunities elsewhere.

"I've told [Riqui Puig] that he has a future here, but it depends on the player," Koeman told Spanish publication Marca.

"I'd recommend that he went out on loan.

"At 20 years of age, the young players have to play. They can't get stuck for a period of time.

"We've got three weeks and we've got competition."

Antoine Griezmann's early goal helped Barca past Elche, as the forward, Ansu Fati, Lionel Messi and Philippe Coutinho all started.

Coutinho is back from his loan spell at Bayern Munich and Koeman talked up the playmaker.

"Let's hope we can see a great version of him. For me, he's a great player," he said.

"He works well physically and with the ball. He's an important player for the team."

Barcelona will begin its LaLiga season against Villarreal on 28 September (AEST).