Manchester City have launched a fresh legal challenge against the Premier League over new rules governing sponsorship deals which the club claims are "void".
Last year an independent arbitration panel found aspects of the league's Associated Party Transaction regulations (APTs) to be unlawful after a lawsuit instigated by the champions.
The rules were formed by the Premier League to prevent clubs from profiting from commercial deals with companies linked to their owners that are deemed above "fair market value".
In November a majority of top-flight clubs voted to approve amendments to the APTs, despite opposition from City.