The Portuguese made the comments following his side's 1-0 defeat to Crystal Palace away from home in the Premier League on Saturday.
"Every match matters," The Mirror quotes the 51-year-old as saying. "But these matches, when you have to win, obviously they matter. I don't think it's the moment to speak about next season and the market, but it's clear to everybody that Chelsea next year wants to bring a striker.
"That is clear. It's also clear we want to improve our players. What's the future for the [current Chelsea] strikers? The ones that are staying are competing with the striker we are bringing.
"And normally at the end of the season, players that are not playing a lot or players who are not happy and prefer a change, that is also part of the market. We want to improve the team and the players and make some surgical movements in the transfer window."