The Belgium international goalkeeper helped the Blues to a 1-0 FA Cup final victory over Manchester United on Saturday, but with just a year left on his contract, doubts surround his future.
Real Madrid are one of the clubs interested in the 26-year-old and he has suggested that he could be ready to leave if his current employers cannot meet his ambitions.
“I love this club but we need to see how the club is going forward,” he told BT Sport. “We want to win trophies, but we want to play for the title, too. We need to see how Man City and United are spending. If Chelsea want to be on top, we need to show it.
“I still have one year left. I’ll speak with Chelsea now, maybe after the World Cup.”
One major factor in Chelsea’s future is the identity of their manager next season, which remains uncertain.
Antonio Conte is strongly tipped to leave the club in the summer and Courtois would not be drawn on the manager’s future.
“I don’t think it’s a question for the players. It’s a question for the board,” he said when asked how much the players want the Italian to stay.
Courtois, though, did suggest that the players have suffered from the indecision, which has spread uncertainty around the squad.
“There has to be a clear line for the club,” he said. “We need clarity with where the club is going forward.
“I think that this season, we were surrounded by rumours, and it’s not easy to defend the title when you’re being criticised all the time. We’re happy today, but we’re not happy about not reaching the Champions League.
“You get questioned before games, after games, and eventually it comes into the group. We felt that there was a negative spirit and it’s hard to raise above ourselves. We lost one game, we lost another one, but then it was too late.”