Chris Vermeulen aims to have his racing future decided by the time the MotoGP autumn break ends with the Portuguese Grand Prix at Estoril on October 4.

The Australian has already confirmed that he will leave Rizla Suzuki, with whom he has spent his full time grand prix career, at the end of this season.

Since making his GSV-R debut at the start of 2006 Vermeulen has taken one win, seven podiums, three pole positions and a best championship position of sixth, during the first year of 800cc racing in 2007.

Vermeulen's wet Le Mans victory remains the only Suzuki win of the four-stroke era, but results have tailed off again since and Suzuki is the only manufacturer yet to take a podium in 2009.

As such, both sides seemed to feel that a change was needed.

250cc star Alvaro Bautista has signed to ride alongside Loris Capirossi at Suzuki in 2010, while Vermeulen must decide if he wants to continue in the premier-class or return to World Superbike.

"I don't know yet what I'm doing next season but I hope to know before the next race in Portugal," Australia's Courier Mail reports Vermeulen as saying in Brisbane on Thursday.

"There are some good opportunities in World Superbikes and offers in GP."

Vermeulen, a former World Supersport champion, won ten WSBK races for Ten Kate Honda during 2004 and 2005, the last season of which saw him finish runner-up to countryman Troy Corser.

Having not won the title, Vermeulen could return to WSBK with a clear target and the 27-year-old admitted he is in talks with the Honda, Yamaha, Kawasaki and Aprilia World Superbike teams.

"I'm a racer and I like riding and winning, so I will go with a bike and a team that I think can win races and a championship, either World Superbikes or MotoGP," he said. "I don't see it [returning to Superbikes] as a step down.

"There is good racing in World Superbikes, more than 30 bikes on the grid and a lot of manufacturers now with Aprilia and BMW joining this year and Kawasaki putting a full effort in next year."

The only seats still to be decided in MotoGP are satellite rides at Tech 3 Yamaha, LCR and Scot Honda, plus Pramac Ducati (it remains to be seen what the Kawasaki-backed Hayate squad will do).

But having stated that he wants to be winning races in 2010, Vermeulen then seemed to cast doubt on staying in MotoGP.

"Until there are some rule changes the only way to win [in MotoGP] is on a factory Honda or Yamaha. Even Casey [Stoner] has found that this season," declared the #7.

Suzuki team boss Paul Denning believes that Vermeulen simply 'lost confidence' this season - understandably, some might argue, after so many years on the often out-gunned GSV-R - and that a change will be beneficial for them both.

"Technically Chris is very good but he lost his confidence at some point during the season. In Misano for example, he was doing the same lap times as Loris but lost a lot of ground in the early laps and it's difficult to fight back in those conditions," Denning told the official MotoGP website.

"Chris has been a fantastic guy for Suzuki over the last four years. He never whined, we have never had a problem with him, he's always been professional and did his best.

"But sometimes, for us and for him, a change can be for the best and I think it can be positive for both of us. We wish him a lot of luck for the future."

After 13 of 17 rounds, Vermeulen holds eleventh in the world championship with 84 points, compared with seventh and 97 points for Capirossi. Both riders have taken a best race finish of fifth this year.