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Raphinha's 98th-minute penalty gave Barcelona a crucial victory as it bolstered its lead at the top of LaLiga, pulling seven points clear of Real Madrid.

Madrid is in action on Monday (AEST) when it hosts UEFA Europa League semi-finalist Athletic Club, doing so without the suspended Kylian Mbappe.

Barca was 3-1 down with more than an hour played before Dani Olmo halved the deficit and Raphinha's two goals – the second coming from the spot deep into stoppage-time – sealed a memorable win for Flick's side.

"When we win, we like these kinds of games. We've played against a very good team, they've had good results in the last 10 games, as I said yesterday in the press conference. Their coach is doing a fantastic job," the German boss said.

"I think the goals we conceded have nothing to do with our pressing. We usually press very well, but today we made mistakes. We made it very easy for the opponent.

"But the team did everything, we didn't give up. That's the mentality we have right now. It's great.

"I don't want to talk about the mistakes my players made. I think that everyone can see that the team didn't give up, they did their best for 90 minutes and we got the three points."

But Barcelona faces a nervous wait regarding Lewandowski's condition after the Poland striker went down clutching his leg and was taken off late in the game.

A hamstring injury could now rule the 36-year-old, who has 40 goals this season, out of the Copa del Rey final against Madrid next week, while Barca also faces Inter Milan in the UEFA Champions League semi-finals later this month.

"Lewandowski will have an MRI [scan] tomorrow. We have to wait for the results, we'll know more about his injury," Flick said.