Rennes have accused Tottenham of making a "unilateral decision" to postpone their Europa Conference League tie and will contact UEFA to allow the game to go ahead.
Tottenham announced on Wednesday night that the match had been postponed following several positive Covid-19 cases at the club, just hours after boss Antonio Conte said eight players and five members of staff had tested positive for coronavirus and that the outbreak has left everyone scared and worried for their families.
"We can confirm that our UEFA Europa Conference League Group G home fixture against Stade Rennais will not take place tomorrow [Thursday] after a number of positive Covid-19 cases at the club," read a Tottenham statement.
But Rennes responded furiously with their own statement, claiming Spurs refused to reveal the number of players affected by Covid-19 when competition rules state a match must be played as long as the team has 13 outfield players and a goalkeeper.
"Following the press release published by Tottenham at 9pm, this Wednesday, Stade Rennais FC would like to clarify the following facts," the Ligue 1 club said.
"In a video conference at 7.45pm between representatives of UEFA, Tottenham and SRFC, the Spurs director of football [Fabio Paratici] announced their intention not to play the UEFA Europa Conference League game on Thursday evening.
"[This is a] unilateral decision which has not been confirmed by UEFA in any way.
"The Tottenham representative did not want to announce the number of players affected by Covid when the rule states that a match must be played as long as the team has 13 outfielders and a keeper.
"He argued for a decision by the English authorities without advancing any official document.
"As the match was not officially cancelled by UEFA, Stade Rennais FC upheld their decision to play.
"Faced with this 'London fog', the SRFC reserves the right to approach UEFA. This lack of fair play is all the more glaring as Tottenham had confirmed by email that the match would be held at the start of the afternoon before warning Rennes of their intention not to play just after their landing in London City."
Tottenham have said "discussions are ongoing with UEFA" over a new fixture date.
The statement added: "Additionally, following discussions with the Health Security Agency [formerly Public Health England] and DCMS advisers, the club has been advised to close the first team area of its training centre at this time, in the interests of the health and safety of players and staff.
"All other areas of the training centre remain operational."
The governing body has confirmed to the PA news agency that the game will not be played and discussions over a rearranged date are still ongoing.
Given the worsening situation, Tottenham could consider asking the Premier League to call off the Brighton game on Sunday.
The league works on a case-by-case basis and if a club does request a game to be postponed, it would be a Premier League board decision.