Posh have yet to win on their travels since returning to the Championship and must now take on a Boro side revitalised by recent signings.
Gannon said: "Middlesbrough are a club in transition but there is a growing expectation there. Their season looked like it was going nowhere and now all of a sudden they are talking about how close they are to the play-offs.
"Things have changed around dramatically. They've lost some talented players but have added half-a-dozen signings from Scotland - players I am very aware of after my own time north of the border - and young Kyle Naughton from Tottenham.
"I saw them play at Doncaster last month when they had an excellent 4-1 win and they were fantastic that night. I expect them to have something about them again on Saturday."
Source: PA
Source: PA