The Norwegian saw his side finish sixth in the league last season and during the summer only managed to add three new players to his side, while other stars left.
Harry Maguire and Aaron Wan-Bissaka were brought in from Leicester and Crystal Palace respectively to strengthen a defence that conceded 54 goals last season, while winger Daniel James was added from Swansea to help bring pace to United’s attack.
However, Ander Herrera left on a free to join Paris Saint-Germain and former club captain Antonio Valencia was released by the club.
In addition to this Romelu Lukaku was sold to Inter Milan and later in the window was joined at the Serie A side by Alexis Sanchez on a loan deal.
And while Wenger, who won three Premier League titles and seven FA Cups during his time with Arsenal, believes there is potential in Solskjaer’s United, he thinks they are still not ready to challenge for the title this season.
“When you see Man Utd, they are one of the examples where there is a potential there,” he told beIN Sports.
“But they have not found a collective way.
“Maybe these players are not mature enough to carry the team play of a team like Man United, altogether.
“That is the question mark now.”
Four games into the new campaign and United find themselves eighth in the table with one win, two draws and a loss.
And Wenger admits he is not certain this current crop of players will be able to emulate the achievements of Sir Alex Ferguson’s team who had the likes of Ryan Giggs, Paul Scholes and David Beckham in it.
“You feel there is something coming out but it’s not ready,” Wenger added.
“When you watch them play, they are not a candidate to fight for the championship.
“Will they emulate what Giggs, Scholes, Beckham did over a number of years? Personally, I’m not convinced.”
Following the international break United resume their Premier League campaign by hosting Leicester City on Saturday at Old Trafford.