"I'm not confident", he said.
Whatever the explanation, the lack of new faces compounds issues surrounding the United squad heading into the Premier League season.
Spurs became the first team in Premier League history to not add to their squad in the summer, Manchester United made only one major signing when they clearly needed more, Manchester City refused to pay over the top for Jorginho who was one of their major targets and, Liverpool and Arsenal spent extravagantly to bolster their squads.
Jose Mourinho has repeatedly expressed his desire to strengthen Manchester United's defence after they finished second in the Premier League last term.
The Fiver: sign up and get our daily football email. It is hard for me to understand we finish second.
"We didn't have much money this year, that's the truth after last summer", he explained in his pre-match press conference.More news: Samsung Galaxy Note9 is up for pre-order in India
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"Is hard for me to understand, to feel, to believe we finish second - which I keep saying, and it is sometimes hard to believe, that I won eight championships and three Premier League's but I keep feeling the second last season was one of my biggest achievements in the game".
beIN has one more season to run in its present contract with the new Premier League season getting underway on Friday evening. It provides them the opportunity to approach players in the Premier League like they've never been able to before - it's quite intriguing really.
'It is hard for me to understand we finish second which I keep saying, that I won eight championships and three Premier Leagues but I keep feeling the second last season was one of my biggest achievements in the game'. The manager has to decide which way we play.
The Red Devils coach has cut a sullen figure throughout pre-season with the former Chelsea boss unable to hide his dissatisfaction with Brazil worldwide midfielder Fred being his sides only high profile signing.