The former Black Stars coach believes Guardiola’s achievements make him one of the greatest.
Guardiola enjoyed a hugely successful spell with both clubs before moving to Manchester City in the summer.
The Spaniard is widely regarded as one of the great tactical minds, with many citing his possession-based style of play as something worthy of emulation.
And Avram Grant – who managed Ghana from 2015 to 2017 – believes such sentiments are not far-fetched.
"I think he's one of the greatest coaches in history. He's one of the best, one of the top, no doubt about this. What he did in Barcelona, even the football that he played in Bayern Munich was amazing," the former Ghana coach told Omnisport.
Grant was however quick to add that Guardiola’s struggles with Manchester City are down to his inability to adapt to the English game.
“But I think Pep didn't do his homework when he came to English football. English football is totally different.
"Even though there are a lot of foreigners, still there are things that are typical for English football. Because when they play good, they are playing excellent, excellent. But still, they are not hard to beat on the defensive side.
"He plays exactly like he played in Barcelona, but not with the same personalities and not in the same league.
"But I'm sure he is a smart guy. He will learn from this and he will do different next season. But this season, it was a good education for him.”
Guardiola is currently in unfamiliar territory, as he is primed to go trophyless for the first time in his coaching career with Manchester City.