Fernando Alonso

Two-time Formula One world champion Fernando Alonso will miss the opening race of the 2015 season in Australia after suffering concussion in a crash in testing on February 22, his Mclaren team confirmed on Tuesday.
"In order to limit those environmental risk factors, specifically, his doctors have advised that he should not compete in the imminent Australian Grand Prix meeting, which will take place on March 13th, 14th and 15th," McLaren said in a statement.
"Fernando has understood and accepted that advice, and the two McLaren-Honda cars will therefore be driven in Australia by Fernando's team-mate Jenson Button and the team's test and reserve driver Kevin Magnussen."  
Source: AFP