Angel Di Maria has revealed the difficulties he faced during his time at Manchester United ahead of Paris Saint-Germain's Champions League encounter with the Red Devils.
United signed the forward in August 2014 for £59.7m, a British record transfer fee at the time.
Louis Van Gaal, who signed the Argentine as Red Devils manager, described the Argentine as 'world class'.
But things didn't go to plan at Old Trafford, and after one season in England the winger was sold to PSG.
The French champions are unable to select an injured Neymar in Tuesday night's clash with Man United and Di Maria is in line to face his former team.
Ahead of the last-16 first leg tie the 30-year-old spoke to radio station France Bleu about his spell in Manchester.
He said: 'I only stayed one year. It wasn't the best period of my career, or they didn't let me have my best time there.
'There were problems with the coach at the time. But thanks to God, I was able to come to PSG and be myself again.'
United go into the game in brilliant form with Ole Gunnar Solskjaer having guided his team to ten wins in their last 11 in all competitions.
PSG meanwhile have won their last two after losing 2-1 to Lyon in Ligue 1, but boast a squad containing excellent players.