Wayne Rooney said he was "embarrassed" towards the end of his time at Manchester United because of a lack of opportunities.
Rooney, the all-time leading goalscorer for both United and England, featured in 39 of the Red Devils' 64 matches in 2016-17 - his last season at the club.
"There are moments when you do doubt yourself," he told Sky Sports.
"I believe I was good enough to get back in the team, but I never really got that opportunity."
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The 33-year-old added: "I came on for one minute in the Europa League final. I was about to come on against Southampton in the League Cup final, and in those moments it was embarrassing.
"It was getting to a point where I was embarrassed. I thought 'I can't keep doing this', as hard as it was to leave United.
"In the Southampton game, [manager Jose] Mourinho came to me and said: 'I want you to lift the trophy.' I was like: 'Well, I didn't even play in the game.'
"He was persistent with it, and I literally lifted it and moved it on. What was I doing? I need to move on and go somewhere else."
Source: BBC