Former Manchester United assistant coach Rene Meulensteen is critical of their two senior signings yesterday.
Meulensteen believes the arrivals of Alex Telles from Porto and free agent Edinson Cavani at Old Trafford come with major risks.
He told talkSPORT, "They're still vulnerable at the back no matter what combination they come up with, it hasn't worked for them.
"Obviously they're going to bring Telles in, another left-back, from a league that you can't compare with the Premier League, so he'll need some time to bed in.
"He's 27, which is an age where you expect players to hit the ground running. Cavani is 33, I'm not saying he's not a proven goalscorer and it cannot work, but it sounds a little similar to when Higuain went to Chelsea.
"The Premier League is a different kettle of fish so I'm a little bit cautious to bring in a 33-year-old.
"Again, how will that shape United up front? As the style will change with an out-and-out striker."
