Chelsea manager Frank Lampard is not giving up on his preferred 4-3-3 formation.
The Blues have used the system for a majority of this season.
While it brought great results in the early days of the campaign, two losses in a row to Everton and Wolves have caused some fans to think a shift is needed.
But Lampard believes the system can succeed.
Asked about tactical changes, he told the club's website: "I have to do what I believe in and what we have done this season.
"The unbeaten run probably coincided with us turning to 4-3-3.
"I felt it was a way forward for us and it's bringing out a lot of the strengths in the players. We were doing it very well.
"There are things within that system I want to do, how we were moving the ball and building our play and pressing.
"We came off that a little bit. It's not like we were doing things terribly in my opinion, we were just doing things at 70 per cent.
"For instance, the second goal against Wolves. We were four against two, so you've got to make sure you don't allow the player to turn.
"It's counter-pressing situations that against Tottenham we absolutely nailed for 90 minutes.
"So there are little things and that's the lesson for the players to have to react in-game and pick up those moments and get them right."
