Mkhitaryan joined Manchester United from Borussia Dortmund in the summer of 2016.
However, he was often left out of the starting XI, and squad altogether, by manager Jose Mourinho in his first few months at the club.
The Armenian gradually became a key part of the side later in his debut campaign but fans have really started to see his best this term.
Only David Silva with six has more assists in the first seven Premier League games of the season than Mkhitaryan (five).
Winterburn says it is because he is playing in the position he became accustomed with at Dortmund.
“I think he’s an outstanding player,” Winterburn said on Sky Sports of Henrikh Mkhitaryan.
“We’ve seen a little bit of a different role for him, he’s played in the hole as well for Manchester United, in behind the main striker.
“With that he can switch and go out to the right-hand side, if (Juan) Mata’s playing then Mata can come and play in the hole.
“I think with Manchester United they’ve got so much versatility up front now.
“I think his best position is in that hole because he’s got good ability, he’s got good pace, he can go past players and he can also run in behind as well.
“I always feel players running in behind always cause the opposition defenders lots of problems.”