Fredi Kanoute faces a race against time to be fit for this weekend's derby encounter with Real Betis as he continues to struggle with a groin injury.
The Malian striker is being carefully watched by the Sevilla coaching staff during training, with the surprise title challengers prepared to pull him out if he shows any sign of aggravating the problem.
"We are worried about him," confirmed coach Juande Ramos. "We are having to weigh up what to do with him.
"The main thing is to ensure that he returns to 100 per cent fitness because we do not want him to play at anything less."
After playing in the Copa Del Rey first-leg meeting with Betis last week, Kanoute was rested for the goalless draw against Real Sociedad at the weekend.
The former West Ham United and Tottenham Hotspur striker has become a key player in the club's push for silverware, both domestically and in Europe.
In his first season at Sevilla he scored just six league goals, and has never scored more than 11 in one season, but he already has 16 to his name this term.