1: "Perez on standby for Red Bull"

2: "F1 driver Sergio Perez gets deadline"

3: "Red Bull considers Perez as replacement"

4: "Perez prepared to step in for Red Bull"

5: "Deadline set for Perez by Red Bull"

6: "Perez ready as F1 replacement driver"

7: "Red Bull eyes Perez as backup option"

8: "Perez on standby for F1 team Red Bull"

9: "Sergio Perez awaits Red Bull's decision"