But Valencia, on duty with Ecuador in the Copa America, said: "I heard about this on the news - I do not fear his arrival.
"The season is long, and under Alex Ferguson everyone will get their chance in United's key matches.
"Ashley is a good footballer and I believe that he will help us towards even more success next season.
"As for myself, I have two seasons left at United and I am convinced I will fulfil those. And maybe a few more years, too."