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Barcelona were expected to activate the release clause in Nico Williams' release clause this week but it seems the proposed transfer may have hit a hitch.
According to Mundo Deportivo, negotiations have stalled which have taken Barcelona by surprise and left the club worried.
Nico's agent is said to want guarantees over his registration as they do not want a repeat of Barca's saga from last season with Dani Olmo and Pau Victor.
Williams is said to have had similar doubts last season which is why he ended up staying put and Barca moved for Olmo instead.
Barca are said to have offered assurances to Nico and his team that he will be registered but it's thought that is not enough right now for them to put pen to paper.
It's not clear what will happen next. Barca are thought to need a major sale to register Williams, with Ronald Araujo seen as the most likely player to go if a sale is made.
However, the prospect of Williams staying at Athletic looks difficult now - with fans furious at the Spain star - meaning previous suitors Bayern are likely watching the situation with great interest.