The Belgian international was not even among the substitutes for Chelsea during their 3-0 victory over Schalke in the Champions League on Wednesday evening.
After the game, Mourinho revealed Hazard did not attend the pre-match training preparation although it is unclear whether he did not turn up or simply didn't train.
Nevertheless, the Chelsea boss did not looked pleased with the Blues star, who sat and watched the game behind the Blues dugout.
Mourinho did go on to say that Hazard is very much part of his plans for the upcoming match against West Bromwich Albion at Stamford Bridge on Saturday - but said that could be on the bench or starting.
Several changes were expected after Chelsea's 2-0 defeat to Newcastle last week. Mourinho said he got the team selection wrong on that occasion, and David Luiz and Juan Mata were among the casualties against Schalke.
Hazard was another whose place was thought to be in jeopardy.
He was challenged by Mourinho at the start of the season to improve his consistency to ensure that he didn't become a "wasted talent".
He's shown flashes of brilliance again this term, but has failed to produce that on a continued basis.
Chelsea comfortably saw off the challenge of Schalke in what was a low-key affair at Stamford Bridge on Wednesday night.
Two goals from Samuel Eto'o and a late volley from Demba Ba was enough to put Mourinho's side top of Group E.