The nine-times European champions are one point behind La Liga leaders Barcelona, who host Real Valladolid at the same time on Sunday.
An exciting final-day showdown, however, may not be enough to save Pellegrini, who has clearly been affected by the steady stream of rumours in the media linking Inter Milan's Jose Mourinho with the Real job for next season.
"All year, and especially in recent weeks, perhaps there hasn't been a clear reply (from the club on my continuity)," Pellegrini told reporters.
"Amidst the uncertainty I have always had the support of the players."
"I don't think Real speak behind the back of their coach, this isn't their style," he added. "But I am not so innocent to believe that all the rumours are simply speculation by journalists.
"If, for whatever reason, the project doesn't continue the person who comes in will have a difficult job... he will have to win more than 100 points in the league to do better than me.
"I know failing to win a title isn't good but I don't think the final decision will change much whether we win the league or not."
Real were embarrassed by third tier club Alcorcon in the King's Cup and dumped out of the Champions League by Olympique Lyon at the last 16 stage in March.
Pellegrini's future is unlikely to be known immediately, but a local media frenzy is expected when Mourinho leads Inter Milan to the Bernabeu for the Champions League final against Bayern Munich on May 22.
