By Jamie Spencer Chelsea are at risk of being without a shirt sponsor at the start of the Premier League season for the second year in a row, having yet to find a partner. A partnership with Three ended after the 2022/23 season and Chelsea did not reach a deal with Infinite Athlete to take over as a front of shirt sponsor until late September. By then, the Blues had already played eight games across the Premier League and Carabao Cup in a sponsor-less shirt. It was only a one-year contract but, amid confusion in May, it was thought that Infinite Athlete, a sports data tech firm, would continue…