Valencia scored one and created two during United’s 5-0 thrashing of Wolves on Sunday.
The Ecuador international made his first appearance in just over a month due to a hamstring injury.
“He could be very important,” said Ferguson.
“His form before he got the injury was outstanding.
“Now he is back we hope he stays back fit. He is such an honest, hardworking player.
“You get two sides to Antonio. He is prepared to work really hard. He can tackle, he can run, but he can also beat a man.
“He has got everything really.”
