The Gunners full-back expressed his sadness that the 59-year-old's project at Malaga is coming to an end and believes the Chilean boss taught him more than any other manager
Monreal enjoyed a productive two-year spell under Pellegrini's guidance at Malaga, helping the Andalusian outfit establish themselves in the upper echelons of La Liga and qualify for the Champions League.
The Spanish left-back joined the Gunners from los Boquerones in the January transfer window, and admits he is sad to see 59-year-old leave the La Rosaleda.
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"He knows everything there is to know. It's a shame that the project is falling apart. I hope [Malaga owner] Sheikh Al-Thani reconsiders, because the people there deserve better."
The 27-year-old Spain international has impressed since arriving at the Emirates Stadium at the turn of the year and credits current boss Arsene Wenger with his speedy transition to life in England.
"Arsene Wenger is Arsenal's linchpin," he continued. "Everything goes through him. He's a motivator. He gave me confidence by putting me in the team as soon as I arrived".
Monreal has been particularly impressed by Tottenham winger Gareth Bale since moving to the Premier League, and believes the north London club will stop at nothing to retain his services next season.
"Bale has been compared to Cristiano Ronaldo. He's tall, strong and strikes the ball really well," added Monreal. "He was named player of the season this year and he's the reason Tottenham were in the running for the Champions League until right to the end.
"The Spanish media have linked him with Real Madrid or Barcelona, but I don't see it. Spurs will do everything they can to keep him."