“I felt he drifted into being something he wasn’t. But you can see him now working with a clear plan.
“Now he is working with a clear way of working with a plan and you see the benefits.”
Guardiola says he expects a different Celtic team who were thrashed 7-0 by his former club Barcelona in the opening group fixture.
“We expecting them to play with great intensity,” he said. “I’ve heard about the atmosphere here.
“Records are nice but what is more important is that we continue to improve as a team and win trophies at the end of the season.”
CELTIC (4-2-3-1): Gordon; Lustig, Toure, Simunovic, Tierney; Brown, Bitton; Forrest, Rogic, Sinclair; Dembele.
MAN CITY (4-1-4-1): Bravo; Sagna, Stones, Otamendi, Kolarov; Fernandinho; Nolito, Gundogan, Silva, Sterling; Aguero.
Referee: Nicola Rizzoli (Italy)
TV: BT Sport 2 K.O. 7:45pm