After winning the Premier League and FA Cup previous season, City became only the second English team to clinch the Treble by defeating Inter Milan in the Champions League final 1-0.

City begin their Champions League championship defense at home against Red Star Belgrade on Tuesday.

“It’ll be simpler. “The first one is the most difficult to win,” Guardiola added.

“Winning the Champions League is fantastic for our club, but how many clubs have won one? A lot.

“We haven’t done anything special with just one, but we are incredibly proud.”

The City manager stated that he has not re-watched his team’s 1-0 victory over Inter Milan in Istanbul, which was scored by Spain player Rodri.

“I didn’t watch the game, not at all,” he admitted.

“I had the impression they [Inter Milan] were a good team.” They demonstrated it. It was a close game, but they demonstrated their strength and are a candidate once more.”

City, who lead the Premier League with five wins in a row, will not dwell on last season’s Champions League triumph, according to England defender Kyle Walker.

“What we did is now in the past; it’s a new season.” Walker, who signed a contract extension with City last week, said, “The manager drew a diagram and had us at the bottom of the mountain and we have to climb it again.”

“Going again is what separates good teams from great teams.”

City is joined in Champions League Group G by German club RB Leipzig and Swiss side Young Boys, in addition to Serbian side Red Star Belgrade.