Bookmakers on Saturday night suspended betting on Chelsea sacking Rafael Benitez as manager following the 3-2 defeat at Newcastle.
Benitez was already under pressure going into Saturday's trip to Tyneside and that pressure has increased after the defeat at St James' Park.
Moussa Sissoko scored twice on his home debut as Newcastle came from behind to beat the Blues, who lost former Magpies striker Demba Ba in the first half with a head injury following a kick by Fabricio Coloccini.
Minutes later, Jonas Gutierrez opened the scoring. Chelsea drew level through Frank Lampard and went ahead thanks to Juan Mata.
But new signing Sissoko equalised after 68 minutes and smashed home the winner for Alan Pardew's side in stoppage time.
The result led to bookmakers Paddy Power on Saturday evening suspending betting on the Spaniard being the next Premier League manager to lose his job.