A rush of announcements in recent weeks have served to firm up a few positions on the 2011 World Superbike Championship grid, though much is still to be decided.

The most obvious change to the list below is the absence of the factory Ducati team, which will withdraw from World Superbikes at the end of this weekend's event at Magny-Cours. Though their place will be assumed by privateer entries - Carlos Checa and Jakub Smrz so far -, the Italian firm's decision to quit will still be felt next year.

Elsewhere, Yamaha and BMW have firmed up their line-ups with the former luring MotoGP rider Marco Melandri and Supersport race winner Eugene Laverty, while the latter will be fronted by Troy Corser and Leon Haslam.

Haslam's defection came as a result of Suzuki's decision to limit its factory involvement, the Alstare team down to just one bike as a result, while Ten Kate Honda could be forced to follow suit with just a single machine for Jonathan Rea.

Aprilia will retain its champion Max Biaggi and British prot?g? Leon Camier, while Kawasaki finds itself in the unusual position of having too many talented riders disputing its two seats, with Tom Sykes's recent form creating a major headache for bosses who had originally plotted a Chris Vermeulen-Joan Lascorz line-up.

More will become clear as the weekend progresses no doubt as testing is due to start in earnest at Magny-Cours just a day after the races.

Aprilia Alitalia
Max Biaggi
Leon Camier

Suzuki Alstare Michel Fabrizio Sylvain Guintoli

Yamaha Sterilgarda
Marco Melandri
Eugene Laverty

Ten Kate Honda
Jonathan Rea TBC

BMW Motorrad
Troy Corser
Leon Haslam

Kawasaki SRT
Chris Vermeulen Tom Sykes Joan Lascorz

Althea Ducati
Carlos Checa 2nd bike TBC

Liberty Ducati
Jakub Smrz

Pedercini Kawasaki Tom Sykes

DFX Aprilia Noriyuki Haga

Italics represent rumoured, not confirmed