Dani Parejo missed Valencia's 2-1 friendly defeat to Feyenoord on Saturday, amidst reports that he is no longer committed to the club.
According to Marca and Superdeporte, Parejo's absence was a warning from Coach Pako Ayestaran he would not tolerate players not pulling their weight in training, despite an injury precaution being the official word.
The midfielder's reported conduct is said to have stemmed from Los Che rejecting a €10m bid from Sevilla last week, on the grounds that they do not want to strengthen a direct rival.
Parejo endured a difficult 2015-16 campaign as he was stripped of the Valencia captaincy by former boss Gary Neville back in December.
However, the club are keen to retain the 27-year-old in light of Andre Gomes' imminent switch to Barcelona and plan to use him as a No 10 next season.
Valencia have also lost Alvaro Negredo, Pablo Piatti and Sofiane Feghouli this summer and are loathe to see more experience head out of Mestalla.
The former Real Madrid man has a release clause of €50m, meaning his employers are unlikely to let him go for significantly less, given they have just recouped big money from Gomes' sale and Negredo's Middlesbrough loan.