There are five clubs, separated by two points, who are playing to avoid the final Primera Liga relegation slot. Recreativo Huelva and Numancia have already gone down.
The four matches involving Osasuna, Sporting Gijon, Real Betis, Getafe and Real Valladolid all kick off at the same time on Sunday, and each club has its future in its own hands. A win guarantees safety.
"I calculate we will have around five or six signings including the best in the world and the best in Spain," Perez told radio station Cadena Ser.
"We aren't nervous or feeling the pressure, but are confident that the fans will be with us. We will be 56,000 against 11," Betis's Chilean forward Mark Gonzalez told the club website.
"It will be very difficult to match their level of motivation because they come with relegation in play. But the anxiety could work against them," Racing defender Ivan Marcano told the club website.
"We are almost there and a draw is enough," Atletico striker Sergio Aguero told sports daily AS. "We are on a good run of victories and if we continue on the same path it will be impossible for them to beat us."
