BARCELONA's 4-3 comeback win over Celta Vigo showed the team will never give up, coach Hansi Flick said after Saturday's victory which was only dampened by Robert Lewandowski's injury.

Raphinha's 98th-minute penalty gave Barcelona a crucial victory in the LaLiga title race where they now have a seven-point lead over Real Madrid, who play fourth-placed Athletic Bilbao on Sunday. 

Flick said it was one of those comebacks that nobody forgets easily, adding it was not easy to win after Borja Iglesias netted a hat-trick to give Celta a 3-1 lead.

"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," Flick 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."

With a double in the second half, Raphinha has now scored 30 goals for Barcelona in all competitions and Flick could not contain his delight as he hugged the Brazilian after the full-time whistle.

"I hugged Raphinha because things weren't going his way in the first half. I told him to think positively and in the second, it showed," Flick said.

"At halftime I told Raphinha, 'Come on, think positively. We need you on the pitch as a leader.' Then he went in and put that performance."

But Barcelona will be sweating over Lewandowski's fitness after the Polish striker went down clutching his leg and was taken off late in the game.

A hamstring injury may rule the 36-year-old -- who has 40 goals this season -- out of their Copa del Rey final next weekend against Real Madrid while Barcelona also face Inter Milan in the Champions League semi-finals later this month.

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

With the score tied at 3-3 after Celta's Borja Iglesias netted a hat-trick, the game seemed to be heading for a draw when Dani Olmo won a penalty deep into added time and Raphinha stepped up to score and seal the three points.

The result puts the pressure back on Real Madrid who play fourth-placed Athletic Bilbao on Sunday. Celta Vigo are seventh with 43 points.

"This is football. We wanted to win this game but we weren't always at our best. But the team came through in the end and the crowd pushed us on right to the finish," Barca substitute and goalscorer Dani Olmo told DAZN.

"It's three points towards our objective but we have to keep going."

Barcelona took the lead when Ferran Torres picked up the ball in midfield and found space to dribble towards goal, pulling the trigger from the edge of the box to beat goalkeeper Vicente Guaita for his 10th league goal of the season.

But Celta responded immediately when Pablo Duran put in a superb cross from the wing and as Wojciech Szczesny sprinted off his line to collect the ball, the Polish keeper missed it to give Iglesias a tap-in into an empty net.

Barca went behind seven minutes into the second half when Frenkie de Jong made an error and completely missed a long ball, allowing Iglesias to run through and beat Szczesny to grab his second goal.

IGLESIAS HAT-TRICK

As Barca pushed forward to find an equaliser, a Celta clearance found Iglesias again and he capitalised on the home side's high line to sprint through on goal and beat Szczesny for a third time to claim his hat-trick.

A stunned Barcelona tried to recover quickly and they got one back in the 64th minute when Robert Lewandowski and Raphinha combined to find Olmo, who scored five minutes after coming on as a substitute.

"He (coach Hansi Flick) told me we needed to play a little more calmer. We just needed to connect with each other better," Olmo added.

Four minutes later, Barcelona levelled it at 3-3 when Lamine Yamal crossed the ball into the six-yard box where Raphinha rose above the defence to head home.

A shell-shocked Celta looked to leave with a point but Olmo earned a penalty when he was fouled in the box and the referee had no doubts when he pointed to the spot after a VAR check.

Raphinha then stepped up and blasted the ball into the top corner in the 98th minute for his 30th goal in all competitions this season.

"It's a bittersweet feeling because we did a lot of things right. They've got such a high level, especially in the final third. They're capable of these things," Celta's Pablo Duran said.

"We should be very proud of ourselves, coming here and showing a lot of character, playing our football. For a lot of the game we were better than them, but we go away with a bad feeling because of the result."