MotoGP world champion Marc Marquez feels lapses in concentration have affected his performances in the wake of his title-clinching triumph at Motegi in Japan.

The Repsol Honda rider was a model of consistency all season and wrapped up his third premier class crown at Honda's home circuit last month.

However, Marquez fell while leading the Australian Grand Prix at Phillip Island in the following round and also slid out in the penultimate race of 2016 at Sepang in Malaysia, registering his first non-finishes of the season.

With the pressure off in the wake of his title success, Marquez admits he may have lost some focus in the last two races, something he hopes to put right in the season finale at Valencia on Sunday.

"These last two races were not the best way to celebrate the title but it looks like I need some pressure to be always concentrated and to finish all the races, like when I was fighting for the title," he said.

"But here, it is a circuit that I like and I will try to do my best. The last two races have been not so good on Sunday but the performance was very good.

"Here in Valencia is it always great and nobody this year has [any extra pressure] so more or less everybody will push at 100 per-cent and we look forward to great weather like today."

Marquez is reluctant to look beyond this weekend's race to the post-race test next week when preparations for 2017 will get underway in earnest, but the five-time world champion acknowledges it will be an important two days, with 'many things that we can improve'.

"On Tuesday and Wednesday the 2017 season starts already so we must be very concentrated to try to improve our bike because I think we have many things that we can improve - we just need to find a way," he said.

"Already I don't speak a lot about the test because I want to concentrate on this weekend's race and then on Monday we will speak about the test, but yes it is important to start in a good way for 2017."