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Having started its LaLiga title defence with back-to-back victories over Elche and Athletic Club, Barca welcomes Rayo Vallecanp to Camp Nou on Tuesday.

Raphinha and Fermin Lopez have each scored three goals in LaLiga already this season, with Karim Adeyemi the other Barca player to find the net in the competition.

Yamal, by contrast, has cut a frustrated figure at times since returning from Spain's triumphant World Cup campaign, failing to provide a goal involvement in the Blaugrana's first two games despite no player creating more than his six chances (level with Raphinha).

But when asked if he had any concerns about Yamal's demeanour, Flick said: "It's always good for players to smile. I don't smile every day, either. 

"Everyone is conditioned by how good Lamine is. He played in the World Cup after his injury and now returns from a three-week vacation. 

"Maybe he's not at his best level, but I'm very happy with what he's brought us in the first two games. 

"Against Athletic Club, he already played 90 minutes and that is great news. You haven't been able to see him, but today he did great in training. He's on the right track."

Barca introduced Rodri from the bench just past the hour mark against Athletic, having paid €76.5m (£65.4m) to sign the World Cup Golden Ball winner from Manchester City.

Flick says the former Ballon d'Or winner could play a larger role on Tuesday.

"He's had some problems in the last few days, but today he trained and had a really good feeling," Flick said. "Of course he is ready to be a starter. We will see what happens."

Barca is reportedly close to signing striker Gabriel Jesus from Arsenal ahead of the transfer window slamming shut on Wednesday, with Atletico Madrid insisting it will not sell Julian Alvarez to its domestic rival. 

Visitor Rayo has just one point on the board after its opening two matches, having started with a 2-1 defeat to Sevilla before drawing 1-1 with Alaves.