The Belgian goalkeeper has been linked with French champions Paris Saint-Germain while recent murmurings suggest he is being lined up by Liverpool.
Antonio Conte's imminent arrival at Stamford Bridge has cast doubt over the 23-year-old's future in West London but Courtois himself has made it clear that he wants to remain a Blues player for the foreseeable future.
"I have a contract for three years, so I will say 100 per cent," he told Le Parisien.
"Rumours affect any club where things are going badly. People think the top players want to leave because they are not in the Champions League.
"Everyone knows it is our fault we will not play in that competition next year. It has happened to Manchester United and to (Borussia) Dortmund, to not play in the Champions League, and it is heartbreaking.
"This year, we have not defended our title well like we needed to. We must regather our forces to return stronger and get back to the Champions League."