Red Bull driver Sebastian Vettel has posted the quickest time in the second practice session of the Italian Grand Prix at Monza.

The Championship leader clocked a time of 1:24.453s to finish marginally ahead of teammate Mark Webber.

Lotus pair Kimi Raikkonen and Romain Grosjean completed the top four, while Ferrari's Fernando Alonso finished fifth.

Britain's Max Chilton recorded the first lap of the second session but was quickly overtaken by Raikkonen, who set the early pace with a time of 1:25.725s.

Lewis Hamilton, who delivered the fastest time during the first practice session, finished sixth for Mercedes, while Jenson Button was ninth for McLaren.

Second practice full standings:

1. Sebastian Vettel (Red Bull)
2. Mark Webber (Red Bull)
3. Kimi Raikkonen (Lotus)
4. Romain Grosjean (Lotus)
5. Fernando Alonso (Ferrari)
6. Lewis Hamilton (Mercedes)
7. Nico Rosberg (Mercedes)
8. Felipe Massa (Ferrari)
9. Jenson Button (McLaren)
10. Sergio Perez (McLaren)
11. Paul di Resta (Force India)
12. Esteban Gutierrez (Sauber)
13. Adrian Sutil (Force India)
14. Pastor Maldonado (Williams)
15. Jean-Eric Vergne (Toro Rosso)
16. Nico Hulkenberg (Sauber)
17. Daniel Ricciardo Toro Rosso)
18. Valtteri Bottas (Williams)
19. Max Chilton (Marussia)
20. Charles Pic (Caterham)
21. Giedo van der Garde (Caterham)
22. Jules Bianchi (Marussia)