City have been dominant in the Premier League this season, winning 16 of 17 games and scoring 52 goals to earn praise for their approach.
Guardiola led Barca to three La Liga titles and two Champions League crowns, and his success in England has come as no surprise to Pique.
The Spain defender, who was part of Guardiola's famous Barca side, says he wants to face his former manager in Europe this season – in the Champions League decider.
"I trust him a lot and last year I thought that he would win everything because I knew the potential Manchester City have with him as a coach," Pique told Telegraph Sport. But it wasn't possible and he needed that process to adapt to the country. Now you can see the players know what Pep wants and how he wants them to play."
Pique has also been full of praise for Guardiola, saying the ex-Bayern Munich boss is among the world's best thanks to his results and style. He added: "For me, he is one of the best coaches in the world.