Bayern Munich midfielder Javi Martinez is determined to seal a move back to Athletic this summer after eight trophy-laden seasons at the Allianz Arena.
Goal understands that Martinez, 32, is ready to cut short his time with the Bundesliga champions.
Athletic are also keen to bring back their former star, and Bayern are prepared to negotiate a sale ahead of the 2020-21 campaign.
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Talks over a transfer are yet to begin and may not be straightforward due to differences in opinion over Martinez's eventual transfer fee.
Bayern hope to receive up to €15 million for the Spain international, while Athletic will not break the €10m barrier.