Valentino Rossi, Marc Marquez and debut pole sitter Cal Crutchlow filled the top three places during morning warm-up for the Dutch TT at Assen.

But the main news was the return of reigning champion Jorge Lorenzo, just two days after breaking his collarbone and one day after surgery.

Cleared to ride in warm-up following a medical examination by the Assen Medical Team and the MotoGP Medical Director, Lorenzo left the pits with 16 of the 20-minutes to run.

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Lorenzo - just seven points behind Dani Pedrosa and the world championship lead - reached eleventh by the midway stage, then eighth, then fifth, then fourth and just 0.3s from then leader Crutchlow!

Improvements by other riders eventually pushed Lorenzo down to eighth (+0.714s) out of the 24 riders. But having also completed 11 laps, Lorenzo will hope to have done more than enough to convince the medical team that he can safely last the 26-lap race.

Crutchlow led the majority of the warm-up session until Rossi and Marquez moved ahead of him on their final laps.

The Italian, seen chatting to factory Yamaha team-mate Lorenzo just before the session, was just 0.001s quicker than Marquez - also riding injured with fractures to his little finger and toe after a Friday morning highside - with Yamaha Tech 3 star Crutchlow a mere 0.033s from the top.

Crutchlow, Marquez and Stefan Bradl will form the front row of this afternoon's grid, followed by Rossi, title leader Dani Pedrosa and rookie Bradley Smith on row two. Pedrosa was fourth this morning (+0.491s) and Bradl fifth (0.547s).

Rossi's warm-up time, of 1m 35.803s, was 1.5s off Crutchlow's pole pace.

Crutchlow jokingly kicked out at Andrea Dovizioso as they rode down pit lane at the start of the session - Dovizioso having received the first Penalty Point from Race Direction for kicking Hector Barbera's bike in qualifying. Barbera received the same punishment for impeding the factory Ducati rider.

1. Valentino Rossi
2. Marc Marquez
3. Cal Crutchlow
4. Dani Pedrosa
5. Stefan Bradl
6. Aleix Espargaro
7. Nicky Hayden
8. Jorge Lorenzo
9. Alvaro Bautista
10. Karel Abraham
11. Randy De Puniet
12. Andrea Dovizioso
13. Bradley Smith
14. Michele Pirro
15. Andrea Iannone
16. Claudio Corti
17. Bryan Staring
18. Michael Laverty
19. Danilo Petrucci
20. Ivan Silva
21. Yonny Hernandez
22. Lukas Pesek
23. Hector Barbera
24. Colin Edwards

Be there! CLICK HERE to see ticket prices for the remaining rounds of the 2013 MotoGP World Championship from the Official MotoGP Ticket Store.