Spain 's Alonso quits Renault with two years left on his contract . Fernando Alonso was deposed as world champion after a controversial 2007 season . The four -time world champion may return to former team McLaren .
Spain 's Fernando Alonso quits McLaren with two years left on his contract . Alonso was deposed as world champion after a controversial 2007 season . The two-time world champion may return to former team Renault .