Barcelona striker Robert Lewandowski says the manner of their Spanish Super Cup final defeat to Real Madrid was "unacceptable".

Lewandowski scored for Barca as they were thrashed 4-1 in Riyadh on Sunday.

The Pole later posted to social media: "This is not an acceptable result. The most sincere apologies to all the culers."

Lewandowski also scored in the semifinal win against Osasuna.

The Pole also was seen, unsuccessfully, trying to put off Vinicius Jr before the Brazilian converted a penalty in Real's win.