The Swans - ninth in the league and 2-0 up against Chelsea after the first leg of their Capital One Cup semi-final - are having a fine campaign themselves, though, and Moyes is anticipating a demanding assignment.
"I've been very impressed with Swansea since the start of the season," Moyes said.
"They have got off to a great start. You take every game individually, no matter what has happened (in meetings) in the past.
"It is a tough game against Swansea - they have had some really good results."