Both players have been linked with moves away from their respective clubs with Atletico Madrid's Griezmann subject to interest from Barcelona.
But, despite the rumours, La Liga president Tebas believes both will stay put.
However, Pique was not the only player who was absent as coach Julen Lopetegui brought an end to the sweltering morning's work in Russian Federation, with Manchester City's David Silva also finishing training early.
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"It wouldn't be so dramatic for the league". "It's extremely unlikely that we'll see another player like him".
Real Madrid superstar Cristiano Ronaldo says he is hopeful "the revelation of the year" Mohamed Salah will be fully fit to compete at the 2018 FIFA World Cup with Egypt to have a shot at the Ballon d'Or.
But he is as merciless as ever in front of goal (he scored 15 goals in nine World Cup qualifiers) and is so feared by defenders that he can shape a game through his personality alone.
Ronaldo was once again in stunning form for Real Madrid last season, netting 44 goals in all competitions.