Pierre-Emerick Aubameyang celebrated with Barcelona stars after their 2-1 win over Real Madrid on Sunday.
Franck Kessie’s goal in injury time sealed the victory for Barca at Camp Nou to send Xavi’s team 12 points clear at the top of the league.
Aubameyang, meanwhile, continues to be frozen out at Chelsea and has not played any game for Graham Potter’s side since February.
The 33-year-old, who left Barcelona in a £12m deal last summer, was left out of the team for Chelsea’s 2-2 draw with Everton on Saturday.
But he was reunited with his former Barcelona teammates the following day as he posed for a photo with Ferran Torres after their El Clasico triumph.
Aubameyang had the chance to leave Chelsea on loan but rejected a transfer move to Los Angeles FC.
The former Arsenal forward, who will still has one year left on his contract with Chelsea at the end of the campaign, is expected to leave Stamford Bridge this summer.
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Speaking last month, Potter said Aubameyang remained in contention for selection despite being dropped from Chelsea’s Champions League team.
‘Pierre is in our squad, he remains an important player for us, he’s worked hard, he knows the situation at the moment,’ Potter said.
‘Nothing’s set in stone, his attitude has been really, really good. We’ll make an assessment as we go forward.’
Aubameyang has played only seven minutes for the Blues since Potter’s comments.