Carlos Checa admits he is at a loss to explain why he endured another tough World Superbike Championship weekend at the Nurburgring, as rumours gather momentum that he is seeking a switch to another manufacturer for 2014.

Hampered by a loss of running on the Friday due to a crash, Checa's weekend was determined by a failure to make it through to Superpole, which subsequently left him a lowly 18th on the grid.

Though he would make gains in both races to finish 10th each time, the 2011 champion says he is frustrated that the positive steps taken during a recent Misano test could not be translated to better results in Germany.

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"What can I say, the results speak for themselves. We made changes between race one and two but unfortunately this didn't make a great deal of difference. I've had trouble getting the right balance with the bike this weekend. Contrary to Misano, where testing went pretty well, here I've had some problems. I don't know, maybe I've lost some of the confidence I had in Misano.

"We've made modifications during the weekend but perhaps I haven't been able to interpret them properly. The team has worked well and I hope we can find a better set-up with which we can improve our results in the next races."

Checa's disappointment comes on a weekend where he has been strongly linked with a possible switch to rivals Kawasaki for the 2014 season. With the announcement of the new rules sparking renewed movement in the rider market, Checa - who is known to have a good relationship with the Spanish-based Provec team that runs the Kawasaki factory effort - is supposedly in talks to leave Ducati to form a three-man line-up alongside the already-signed Tom Sykes and Loris Baz.