Former Manchester United coach Rene Meulensteen believes the imminent arrivals of Alex Telles and Edinson Cavani at Old Trafford come with major risks.
After an underwhelming transfer window which has seen just Donny van de Beek sign from Ajax, United have been pressed into urgent action on transfer deadline day.
Telles is expected to join from Portuguese side Porto and provide competition for Luke Shaw at left-back.
While Cavani is set to compete with Anthony Martial to be United's lead striker after seven prolific years at Paris Saint-Germain.
The late moves for Telles and Cavani come after the failure to persuade Borussia Dortmund to sell Jadon Sancho.
Cavani's last appearance came in March and at 33-years-old, the speed and intensity of the Premier League could be an issue.
And Meulensteen, who worked under Sir Alex Ferguson for six years, feels Telles and Cavani's signings pose more questions than answers.
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“Obviously the Sancho deal doesn’t look like it’s happening anyway but I don’t think they need to spend that amount of money in that position," 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.”