The Gunners are eager to add an experienced defender to rotate with Kieran Tierney in that spot.
While they were hoping to secure Lisandro Martinez, the Gunners may have to concede that Manchester United are more likely to prize him away from Ajax.
According to A Bola, Arsenal have turned their attention to the much cheaper Grimaldo.
The Spaniard has been with Benfica since 2016, and is rated as one of the most consistent defenders in Europe.
He is out of contract next summer, which means the Portuguese giants are ready to cash in on him immediately.
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