Philippe Coutinho concedes he has "not performed as expected" during his time at La Liga champions Barcelona.
The 27-year-old has failed to rekindle his Liverpool form following his €160 million (£143m/$180m) switch in January 2018, struggling to make an impact during his first full season at the club.
The attacking midfielder managed only five league goals in 34 appearances last season and failed to nail down a place in the starting XI, with 12 of his league outings coming from the bench.
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Coutinho's underwhelming form has seen him become a target for Barca supporters who have jeered him on several occasions, while media reports have linked him with a move.