Really?? I am very happy to hear this news and if it is true that Chelsea is collaborating with Stake as its main sponsor, of course that will be extraordinary. We know Chelsea is one of the big EPL teams and indeed the influence is very big, it's not surprising that Stake finally tried to convince Chelsea to be able to get the sponsor's signature. I think this is also a new step taken by Stake with Chelsea and who knows with the presence of Stake as the main sponsor, Chelsea's performance next season will also increase. 
That is quite good news for Chelsea fans and also the Stake company if it is true that they have worked together for next season, but for Chelsea's performance issues I don't think there will be any influence on the sponsors because the performance of a team always depends on how management plays. the team got good players and trained by experienced coaches. So it has nothing to do with sponsors except just about business and finances, but it's pretty good news for both of them to sail next season.