The former Arsenal man says he was expecting more from the Red Devils this season.
United have gone through an indifferent campaign in Louis Van Gaal’s first season in charge, having looked poor at the start only to come back strongly and cement a standing inside the Premier League's top four.
The take on Arsenal on Sunday looking to finish third in the table and avoid the Champions League play-off that come with finishing fourth. While qualifying for Europe’s elite competition was arguably the aim for Dutchman Van Gaal when handed the job last summer, Nicholas says he has still been disappointed by the Red Devils' performances.
“Manchester United have slightly disappointed me,” he said.
“We all look at Manchester United and know the essence was to get into the top four, and it probably was but I still expected more.”
The former Arsenal man also believes that Van Gaal’s failure to settle upon a formation and the players within it earlier in the season is what has ultimately cost them.
The Dutchman has chopped and changed his side throughout the campaign, having employed different systems and used players in various positions, with Wayne Rooney noticeably having spent a large portion of the season as a midfielder rather than a striker.
They did, however, go on a decent run of form once the manager had settled on his best side, and Nicholas says that has got him out of jail somewhat.
“I think they could have done a lot better if they would have gotten these players up and running with the right formation earlier,” he added.
“It took him [Van Gaal] such a long time to get the right formation. In a way, he got out of jail for a spell because they weren’t playing that well but were still getting results, and that is a positive for him.”