In an interview with the Daily Record, the Argentinian superstar sang the praises of the Irish midfielder.
"Aiden McGeady is a fast and skilful winger and someone I rate highly.
"We will have to be very careful with him because his movement can be special and he has a great ability to appear in goalscoring pos itions out of the blue. I really like the way he plays football. He is a natural talent, who can create a brilliant piece of play in the blink of an eye and I can assure you our defenders will be paying very close attention to him.
"He would be successful anywhere in Europe but I know he likes playing for Celtic so I am not sure he would leave."
Messi also warned his team-mates that they will have to be wary of Celtic's aerial threat.
"Scottish football is known for having players who head the ball very well, so it won't be easy for us.
"I hope Gordon Strachan is right about it being an attractive tie. Sometimes when so much is at stake games aren't entertaining," added Messi.