Manchester City will not be able to scale the dizzying heights of last season's treble-winning campaign, manager Pep Guardiola said on Thursday ahead of their Premier League opener against Burnley.

Guardiola's side have won five of the last six Premier League titles and last season also won the FA Cup and expanded their domestic dominance to the continent as they lifted the Champions League for the first time.

Despite City undoubtedly being favourites in every competition they will feature in this season, Guardiola was rather guarded about the team's prospects.

"It will not be possible to do what we did last season, it is once in a lifetime," Guardiola told reporters ahead of Friday's trip to Turf Moor.

"We climbed the highest mountain last season, but in the last two days we came down from it and now we start again," added the Spaniard, whose side were beaten in the Community Shield curtain raiser by Arsenal last weekend.

"Everyone has the same intention and there will be a lot of difficulties to climb the mountain as high as possible. Our football, our level, our mentality will dictate how the season will be."

On Friday, City will come up against a familiar face in Vincent Kompany, with the former City captain having played under Guardiola from 2016-19 before beginning his managerial career.

Kompany took charge of Burnley last season, guiding them to promotion after winning the second-tier Championship, with Guardiola saying that the Lancashire club had been completely transformed under the Belgian.

"Newly promoted sides have the energy and the dream to have a good season. Vinny knows us really well, he did an incredible job last season," Guardiola said.

"He has changed completely the way Burnley were playing with Sean Dyche and destroyed the Championship. He has made an incredible job, it will be a tough, tough game.

"The first game for the champions is so difficult. You need time to reset and we have to come back to where we were. That is a question of time."

Guardiola added that new signing Josko Gvardiol, who was signed for 90 million euros ($99.15 million) from Bundesliga club RB Leipzig last week, could make his debut against Burnley.