The Spanish football federation, which has the final say on disciplinary matters, still has to make its ruling on the incident that has received widespread coverage in Spain.
A furious Diakhaby walked off the field after being involved in a heated exchange with Cala and claimed the Spanish player had used a racist slur towards him in the first half of the game in Cadiz on Sunday.
Valencia's players left the pitch in solidarity with Diakhaby, becoming the first top-flight Spanish team to make such a protest.
The players later returned to resume the match, with the club claiming they were told they would be punished if they refused to return.
Cadiz won the match 2-1, finishing the game without Cala, who was substituted at half-time.