Reigning double MotoGP champion Jorge Lorenzo is pledging to 'fight until the end' in his quest to reel-in rookie title leader marc Marquez.

Lorenzo has slipped 39 points behind the Honda rider with just four rounds and a maximum of 100 points available.

Three of those rounds will take place in the next three weekends, a 'crucial' period of the championship that starts at Sepang in Malaysia on Sunday, a circuit where Lorenzo is yet to claim a premier-class win - finishing second in 2012 and third in 2010.

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"Now we start the big trip with three races in a row and face the last part of the championship, the crucial part," said Lorenzo. "After Aragon where we fought so hard we now visit a special circuit.

"Sepang is a track everybody knows really well. I guess all the riders will be strong there because we made a couple of pre-season tests. Sepang is a long and technical circuit with two great straights but also some nice corners. The worst thing is it's always stormy and you never know when it is going to rain.

"I have some good memories there but we need to keep focus now on the race and try to recover a little bit to Marquez. The championship is difficult but we want to fight until the end. Let's see what happens!"

Team director Wilco Zeelenberg likes Lorenzo's chances at all three flyaway events.

"We are much stronger than at the beginning of the year. I am quite positive for Sepang because Jorge likes the track and also Phillip Island and Motegi that follow afterwards are I think quite good for us," he said.

"[Jorge] is feeling good and strong. Aragon P2 was of course not so bad but we wanted to win. For sure for the next rounds we would like to get some victories to finish the 2013 season in the best way. We will see what happens!"

Lorenzo, who broke his collarbone at Assen and re-damaged it at Sachenring, has won five races this season - just one less than Marquez.

After his Aragon accident, Marquez's team-mate Dani Pedrosa is now 20 points behind Lorenzo, in third. Race Direction will hold a hearing into the Marquez-Pedrosa Aragon incident on Thursday.