 For , McLaren ended their engine deal with Mercedes which included buying back the 40% stake that Mercedes held in the team and reforged their historical partnership with Honda.After a prolonged period, the team announced Fernando Alonso and Jenson Button as their race drivers, with Kevin Magnussen demoted to test driver.During pre-season testing at the Circuit de Barcelona-Catalunya in February, Alonso suffered a concussion and, as a result, Kevin Magnussen replaced him for the season opening in March.