1: "Perez receives deadline from Red Bull for possible F1 driver switch."

2: "Red Bull considers Perez as potential replacement for current F1 driver."

3: "Perez prepares for potential opportunity as Red Bull's F1 driver."

4: "Deadline set for Perez's decision to join Red Bull Racing team."

5: "Speculation grows as Perez awaits decision from Red Bull Racing."

6: "Red Bull Racing gives Perez ultimatum for F1 driver position."

7: "Perez ready to step in as replacement driver for Red Bull Racing."

8: "Mexican driver Perez on standby for potential Red Bull F1 seat."

9: "Perez's fate in hands of Red Bull as deadline looms for F1 driver switch."