Antoine Griezmann "no longer knows how to play football" with Barcelona, according to Bixente Lizarazu.
Griezmann's career trajectory has stalled since his €120 million (£109m/$142m) move to Barca from Atletico Madrid in July 2019.
The Frenchman scored 133 goals in 257 games for Diego Simeone's side at Wanda Metropolitano, but has so far been unable to replicate that prolific form at Camp Nou.
He only managed to find the net in 15 of his 48 outings for Barca last season, and his struggles in the final third have continued at the start of the 2020-21 campaign.