Paul Lambert believes Gabriel Agbonlahor will prove a tough test for Manchester United's defenders when they travel to Villa Park on Saturday evening.
Agbonlahor struggled at the start of the season after sustaining a knee ligament injury but has impressed in recent weeks, scoring the only goal in Villa's win at Sunderland last weekend.
And Lambert says the 26-year-old's speed and strength will cause concern for Sir Alex Ferguson's men.
"I think Gabby's speed is well documented by most people," said Lambert.
"People will look at his speed and think 'we need to watch it'. I think the way he's playing at this minute, he's an absolute handful because his speed is incredible.
"When he gets going it takes a really quick player to get a grasp of him. He has every attribute you want with his speed and his strength.
"I wouldn't like to race him, that's for sure. His actual game in general when he gets at people and is a handful. I'm delighted with the way he's performed.
"I think if he runs at people there are not many people who will catch him. His upper body strength is very powerful.
"He's in top form at the minute and enjoying where he's playing and is certainly doing something right."