Premier League clubs have voted to temporarily block teams agreeing lucrative sponsorship deals linked to a club's owners after the Saudi Arabia-backed £305m takeover of Newcastle.
Eighteen clubs voted in favour of the ban at an emergency meeting on Monday.
Newcastle voted against and Manchester City abstained, with both questioning the legality of the move.
It means a temporary one-month ban on deals linked to club owners while the issue is debated further.
Top-flight teams complained to the league after the Newcastle takeover was completed on 7 October because of frustration about how the deal passed the owners' and directors' test.