Marcelo Bielsa has quit Athletic Bilbao after a row with the Spanish club's board, Marca reported on its website Friday.
According to the sports daily Bielsa and his assistants have walked out after a public row over Athletics's new training centre.
The club published a statement on Friday disassociating itself from Bielsa's criticism at what he perceived was a delay in the construction of the facilities.
"Athletic does not share in any way the personal and subjective view expressed by Marcelo Bielsa at a press conference yesterday (Thursday) concerning the progress of the work (on the centre)....," the statement read.
Bielsa, who led Athletic to last season's Europa League final and Spanish Cup final, extended his contract with the side last month until June 2013.
Source: AFP Global Edition