The Potters haven't enjoyed the best of starts in the Premier League this season and have managed only two points from six games.
However, Mata is still expecting a tough game against Mark Hughes' side on Sunday.
He writes in his personal blog, seen on ManUtd.com: "On the weekend we will face Stoke City in Old Trafford.
"They haven't had the start they expected but it's always tough to play against them. They have very talented players that are able to define a match in an individual action.
"We are looking forward to having two good games at home this week and make the fans enjoy as they did last Saturday. It would allow us to go to the international break with very good feelings."