He said: “What we said was ‘Let’s go to May’. Then we will see.”
Chelsea are 20 points behind Leicester at the top of the Premier League and 11 even off Tottenham in fourth.
Asked whether the Blues could still secure a Champions League place this season, Hiddink offered a realistic view.
“Mathematically it is possible,” he said.
“If you can add up then it is possible, but this league is very strong, which has been especially proven this year with all respect to the clubs at the top – Leicester, Crystal Palace, Watford… it is amazing and refreshing.
“It means that all the teams can kill each other.”
Mourinho received widespread support from the stands on Saturday, but Hiddink hopes they will focus more on supporting the team in future weeks as he looks to guide the club back into European contention.
“I hope the fans will support the team, as they did briefly during the last game,” Hiddink said. “The fans must also think and express themselves about the recent past. The team has to take the initiative. What I know of Chelsea is that the fans back up the team, but the team has to show it first.”
On Mourinho, Hiddink added: “If you look at his record over the years it is amazing. There were many, many titles. But nevertheless things happen in football. People take decisions that they have taken and I come on when I am asked.”
Hiddink refused to compare the current Chelsea squad to the one he managed in 2009, but he did express his belief that Eden Hazard could re-establish himself as a key member of the side having struggled for form in the first part of the season.
“It is a different group of players [to when I was last here],” Hiddink said. “The players at that time were also big players and were leaders. We now have big players, but it is difficult to compare.
“He (Hazard) had a terrific season last year and it is normal that you get a little bit of a setback after that.
“I think he can be a key player as captain of a national team for Belgium. And he can be a key player here .
“It’s the same with him, he has to be eager to perform.”
Hiddink also said he would not be averse to fielding any of Chelsea’s young players if they proved themselves, adding: “I want to analyse them and then we will decide.
“First I must be convinced of their quality, so at the moment it is a little too eagerly to say. But if they show they are competitive I am not against using them.”