The Manchester City loanee returned to the pitch in Thursday's 4-1 friendly victory over Derby County, his first appearance since being left out following a breach of club discipline.
Grealish had missed Everton's meetings with Newcastle United and their subsequent fixture against Coventry City. The club did not disclose the precise circumstances behind the disciplinary action, while manager David Moyes declined to discuss the details publicly.
The 31-year-old used social media to address the situation directly, apologising to supporters and those at the club for being unavailable during the recent run of matches.
“Nice to be back out there with the boys today after a good few days training,” Grealish wrote on his Instagram story.
“I want to apologise to the fans and everyone at the club for not being able to help the team the last few weeks.
“I love playing for this club and can't wait to be back playing in front of you guys in an Everton shirt. See you soon.”
According to The Times, Grealish played the full 90 minutes against Derby, won a penalty and provided an assist. The result offered a positive return after a difficult spell away from competitive action.
Moyes had previously indicated that the decision to leave Grealish out was taken by the club. Before the Coventry match, the Everton manager was asked whether the international break could provide an opportunity to resolve the situation.
“We just need to wait and see how things go,” he said.
Grealish is in his second loan spell at Everton after joining from Manchester City again this season. His first stint brought two goals in 22 appearances, but a foot injury cut short his campaign.
The winger has made six appearances since returning to Merseyside, without scoring, and had been working to rebuild his career after falling out of favour at City. His return against Derby gives him an opportunity to put the disciplinary issue behind him and compete for a place again.
Everton's next Premier League fixture is away to Brentford on 23 November, when Grealish could be in contention to return to the matchday squad.