The Hull City boss is a big fan of the Colombian.
"Falcao is a wonderful player," he told talkSPORT. "When he was at Porto he had a magnificent record and then went to Atletico Madrid for a lot of money. He's an out and out centre-forward. He's a typical number nine and there's not many of those around, most people are now a number 10.
"You wouldn't be surprised to see Manchester United sign him because their greatest strength is the way they keep improving [the squad]."