Alan Archibald's men are in fourth place with eight points from five games and go into the match on the back of a 2-1 win over St Mirren in Paisley in their last outing before the international break.
Thistle's form has been no surprise to the Dons boss who watched them regularly as they battled their way to the Scottish First Division title last season.
"Thistle have been very good so far but I am not surprised," said McInnes.
"I watched a lot of them when they were in the First Division last season and thought that they had a lot of players capable of playing in the top league.
"So I am glad to see them back in the SPFL.
"They have had a couple of good results on the road and they have a feel-good factor after coming up so they will be tough opponents but we can win.
"We've had an okay start to the season. I feel that in five of the six games we have played this season, we have been the better team and I feel there is more to come from us."
McInnes, though, will have to travel to Glasgow without skipper Russell Anderson and forward Niall McGinn
Anderson fractured his hand in a freak training ground incident while McGinn has bone bruising on his foot.