Next it's West Brom and we have to try to win the league on Friday.
Cesc Fabregas set a new Premier League record for assists on Monday when he set up Nemanja Matic for Chelsea's third goal in the 3-0 win over Middlesbrough.
"To my players my message is now that we need to do another step. We need another step and then to celebrate".
He added: "I am convinced you still need to have the ball to create goal chances and that you can not encourage, as well, youth teams to say: "We do not want the ball".
"We've had 36 games with two to go and it's been a tough season", added the manager.
Chelsea are now seven points clear of closest challengers Tottenham, and will wrap up their second title in three years if they can beat West Brom on Friday.
Walker feels Chelsea had to put in very little effort on Monday night against a disappointing Boro side and believes the away side made it too easy for Antonio Conte's men.
With the result having all but ensured Middlesbrough's relegation from the Premier League, Conte stood applauding its travelling supporters before embracing its players and staff.
"Then we had to play against them in the semi-final of the FA Cup. It was a great performance, my players showed commitment, workrate for an three important points", the Italian told BBC Sport.
"On Friday we have a good chance to finish this league, to become champions".
"After every bad game we always recover very quickly, we always respond very well and win", Blues midfielder Nemanja Matic told Chelsea TV.
Chelsea will clinch the Premier League if they win at the Hawthorns.
Chelsea eventually finished 10th in the table as Leicester, 5,000/1 pre-season no-hopers completed a remarkable title triumph.
And Conte has been thrilled with how Fabregas has contributed to Chelsea's cause this season despite not being a first choice in midfield.
Fabio inadvertently directed a Fabregas pass straight at Costa, who cushioned the ball and tucked a shot between Guzan's legs for his 20th goal of the campaign. "We also lost a few games near the start and again there were a lot of critics, but we bounced back as a group very hard".
"I think it's great to see a team that got relegated and to see their fans clap the players".