The Scot recently claimed his 13th Premier League crown as United boss and has lifted Europe's top prize twice but the interim Blues manager feels the resources at his disposal at Old Trafford might have justified more continental glory.
|28/1||Chelsea are 28/1 with BetVictor to beat Manchester United 3-1
"But when you play against another top side, in Europe, it's always more difficult.
"Should United have done more in Europe? I don't know. I think that United is a top side with a top manager and that's it. We will leave it there."
Benitez has also questioned the talent in the Manchester United squad, believing that they are on the same level as Manchester City and Chelsea and only deserved to win the title because of their consistency.
"I think United have been more consistent than anyone so they deserve to win the title but are they better than Manchester City? I'm not sure. Are they better than Chelsea? I'm not sure," he observed.
"Have they been more consistent? Yes, so they deserve to win the title but still you can beat anybody in one game."