Kawasaki has announced that Chris Vermeulen will miss this weekend's Miller World Superbike round.
A serious knee injury from 2010 delayed Vermeulen's start to this season, and the former MotoGP and WSBK race winner was then forced to withdraw from the recent Monza round after injuring his elbow.
As a result, Vermeulen has only completed eight race laps this year, during race one at Assen.
So while team-mates Tom Sykes and Joan Lascorz head for round five in the USA, Vermeulen will instead make preparations for a return at the following Misano race.
Vermeulen will continue his recuperation in Europe during the Miller weekend, then test at Aragon in early June.
This special test should show how his left elbow has healed and give Vermeulen, who missed winter testing, the chance to try different machine settings while also learning the Aragon circuit.
Aragon is KRT's designated test track, and the venue for the seventh round of the championship.
“It is disappointing to not race in America but my injuries are still healing," said the Australian. "The good thing is they are improving. The decision was taken with the team and Kawasaki to miss the race and concentrate on testing.
"That's not only for myself to get some time under my belt away from the racing, but also to get more information about the bike. That means I should hopefully come back strong at Misano which is a track I know quite well.
"I have never ridden at Aragon before so it will be good to get some track time in and learn the track before we go there after Misano.”
The Misano WSBK round takes place on June 12, with Aragon one week later.