Aston Martin stalwart Stefan Mucke will miss the Austin round of the World Endurance Championship later this month to race for the British manufacturer in the clashing Blancpain Endurance Series round in Germany.
Mucke will drive the Motorbase-run Oman Racing Team's V12 Vantage at the Nurburgring on September 20 alongside Ahmad Al Harthy and a third driver, who has yet to be nominated, in the seat so far occupied by Dan Lloyd.
Fellow Aston Martin Racing driver Jonny Adam, who drove the Oman car in the opening four rounds of the BES, will partner Darren Turner in Austin on September 20 after joining the Briton and Mucke in the #97 Vantage GTE at last month's Nurburgring WEC round.
"Stefan is German and Germany is a big market for us, so it makes sense to have him in one of our cars at the 'Ring," AMR's John Gaw told AUTOSPORT.
It will be the first time that Mucke has missed a WEC round since the rebirth of the championship for the 2012 season.
Gaw suggested Mucke would be an obvious candidate to race in the inaugural FIA World GT Cup in Macau on the same weekend as the Bahrain WEC finale in November.
"We are trying to put the budget together for the World Cup and if we did do it, it would make sense for Stefan to be there because he did the event [when it was known as the Macau GT Cup] two years ago," he said.
Nick Tandy is scheduled to race the KCMG ORECA-Nissan 05 at Austin despite the presence of Nicolas Lapierre, who subbed for him when he was on Porsche LMP1 duty at the Spa and Le Mans WEC rounds, on the entry list published today.
The Porsche factory driver will race with KCMG alongside alongside Richard Bradley and Matt Howson in addition to driving his regular CORE-run 911 RSR alongside GT Le Mans points leader Patrick Pilet in the Tudor United SportsCar Championship event on the same day.
Briton Archie Hamilton will make a second appearance for the Swiss Morand squad, sharing its Morgan-Judd/BMW EVO with Oliver Webb and Pierre Ragues.
Earl Bamber will, like CORE Porsche team-mate Tandy, compete in both the USC race and the WEC event in Austin.
The New Zealander will again drive for the Proton Porsche squad in place of Klaus Bachler, who will instead be racing in the ADAC GT Masters series at Zandvoort.
A total of 31 cars are entered for the Austin WEC round, the same as competed at the Nurburgring last month.