Wes Streeting is gearing up for a fight against Andy Burnham in a possible Labour leadership contest – despite backing him to win a by-election that could return him to Westminster to challenge Sir Keir’s premiership. The former health secretary argued that the mayor of Greater Manchester should be allowed to stand in the up-coming Makerfield race, saying Labour needs “our best players on the pitch”. But, despite throwing his weight behind his rival, the former health secretary's allies told The Independent that he would stand as a leadership candidate in any contest. If successful, Mr Burnham is widely expected to challenge Sir Keir Starmer for No10. Wes Streeting’s allies said he would stand as a leadership candidate in any contest (PA Archive) In a post to social media on Friday, Mr Streeting wrote: “The Makerfield by-election will be tough. Votes will need to be earned.…