PSG ace Angel di Maria concedes he underperformed during his season at Manchester United.

Di Maria lasted 12 months at Old Trafford under former manager Louis van Gaal before being sold to PSG.

The Argentina international struggled to find any form at United after joining from Real Madrid.

Di Maria admitted to So Foot: "Manchester United? I know I have not been very good there.

"The causes of this failure are not yet clear, but what is certain is that I could have done much better..."