Grimaldo is having his sixth season with the club whom he moved to at 20 in 2016 and has grown with into one of the best left backs in Europe.
The player was formed at La Masia and could give competition to Jordi Alba, who turns 34 next season.
It's a golden opportunity for Barcelona who need a player in that position, as with his contract up in 2023 he could be bought for 10-15 million euros in the summer.
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