Messi believes his old boss will make the Bavarian outfit even stronger and is relishing the competition.
"I think we have a great team and great players, as we've shown over the years," he said. "I think the arrival of Guardiola will make Bayern stronger. Winning the Champions League is always difficult and our objective is trying to win everything and succeed in all competitions.
"That's how we work at Barcelona.
"You talk of Germany dominating football recently - I don't know what is going to happen in the future. I know Germany have a history of great teams in global football at international level and club level. Winning the Champions League is difficult for anyone, whether they are from Germany or Spain.
"But I know Germany had a great year last year."