Nike appeared to leak images of Chelsea's 2025-26 kit one day before its official launch in a quickly deleted social media post.
The sportswear behemoth has made kit for the west London side since Chelsea terminated their partnership with adidas in 2016.
The Blues were five years through a 10-year deal with the German kit-maker, but called time on the agreement by paying its £40million termination clause.
October of that year saw Chelsea make history with the largest commercial deal in their history, worth a then-record-breaking £900m over 15 years.
But the Premier League side are likely to be less than thrilled with this week's developments, which may have spoilt a much-hyped reveal of next season's kit planned for Friday.