Wayne Rooney is the toughest opponent former Chelsea and Arsenal goalkeeper Petr Cech has faced in his career.
Cech, who is considered as one of the best goalkeepers in the Premier League history says Rooney was the player he was 'most wary of.'
"Wayne Rooney," he told Chelsea's official website.
"Every time we played against United I had to make sure I was aware every time he had the ball because he was very unpredictable and very clever. He is a guy who can chase, who can fight, who can run, who is clever with his shot."
"He could score from the halfway line, he could try and chip you if you were too high. That was a challenge I enjoyed."
The 37-year-old won four Premier League titles and the Champions League with Chelsea since his move from Rennes in 2004. He left the Blues and signed for rivals Arsenal in 2015 and went on to become a key player for the north London side before hanging his boots last year.