Sevilla coach Jorge Sampaoli says Barcelona's Negreira case reflects poorly on LaLiga.
An investigation has been launched into Barca's payments to former ref Jose Maria Enriquez Martinez's company for advice on match officials.
Sampaoli said this morning: "If you check what is said it is very serious, it is a great loss of prestige for the LaLiga. I do not know the case in depth. If the tests that come out are real, staining football like this, and this Liga like this, is very rude.
"It does not have an expiration time. It is to detract from this game, to let it stop being clean."
The Argentine also said, "I am not focused on the depth of the case, but it does make me sad for football. There are many people who save all week to buy a ticket, the ball is tricked and stained."