The Monaco forward officially signed for the Red Devils in the final few moments of transfer deadline day, and the Colombian believes that his compatriot will be a hit at Old Trafford.
He told Sky Sports News: "[Falcao] is a great goalscorer, a natural finisher and he is among the best in the world in that position.
"He will be fine [physically] because he has had ample time to recover [from his knee injury] and his therapy has been great so he should be 100%.
"I'm sure he will do very well for Manchester United."
Falcao is expected to make his United debut when they host Queens Park Rangers on Sunday.