Wayne Rooney this week claimed the Red Devils were close to mounting a title challenge, but Redknapp reckons they've got it all to do next season.
Manchester United have a mountain to climb to win the Premier League title next season, warns Jamie Redknapp.
Louis van Gaal guided the Red Devils back into the top four to qualify for the Champions League, but they still finished a massive 17 points behind winners Chelsea.
Wayne Rooney this week claimed United are close to being able to challenge for a 21st title, but Redknapp reckons they have plenty of work to do to be able to compete for honours.
He said: "They have been bang average this season. I can’t believe so many people think fourth place with no trophy is a good job. They were champions two seasons ago!
"They are a long way behind Chelsea; I can’t see them catching them next season."
United have already agreed a deal to sign PSV winger Memphis Depay, while they have also eyeing a mega-money swoop for Real Madrid star Gareth Bale.
And Redknapp believes Van Gaal needs to strengthen further if the Red Devils want to bridge the gap between themselves and the Blues next term.
He told the Mail: "They have been heavily reliant on David de Gea, Wayne Rooney and Michael Carrick. If De Gea leaves, they need a goalkeeper, a defender and a goalscorer.
"How they must wish they had not lost Pogba to Juventus."