Manchester United attacker Henrikh Mkhitaryan says he's mentally tough thanks to Liverpool boss Jurgen Klopp.
The pair worked together at Borussia Dortmund.
He credits the German for enhancing the psychological side of his game.
"Jurgen Klopp, he trusted me and gave the chance to play in his team, he made me one of his key men and he worked a lot on my psychological part."