The 18-year old is developing very nicely at Ibrox and his performances this season have been extremely impressive, so much so that McDowall suggests he could make as big an impact on Scottish football as McGeady did prior to his £9.5milliom 2010 move to Russian club Spartak Moscow.
"I remember thinking the same about Aiden as I do now with Lewis," McDowall said.
"McGeady came in at Celtic at 12 and was an unbelievable talent even at that age. When you see them, you immediately know.
"And this is the most excited I've been about a talent since McGeady.
"But Lewis has every chance of being a top player for many years. He is one of the youngsters who can complete the journey with us back to the top flight and hold his own when we get there.
"When you play in midfield you have to be more consistent and that's what makes him a cut above. This season he has been one of the first picks in our team. That is how highly we rate him.
"He has the temperament to be an Old Firm player. The first session he came in, he wasn't fazed at all."