The London club sit four points clear at the top of the Premier League table following a fine start to the season, but face a tough task against an in-form Everton team.
Indeed, Everton are unbeaten in their past seven league outings, and ended a 21-year wait for a win at Old Trafford when they beat Manchester United 1-0 on Wednesday.
"He (Martinez) has done remarkably well because they have had some difficult games," he said.
"They have played many of the big teams in the league and overall are in a very strong position.
"They have just come out of a win against Manchester United. We are lucky this season a little bit, because there is always a big warning before we play against these teams when they have exceptional results. That keeps us on our toes. We know it is a big game.
"I don't think there is a danger (of becoming complacent) because we are hungry, we want to win, and we have just put a few results together that will make us more ambitious, but as well conscious that in every single game you need to put a top-level performance in.
"It is a continuity as well because since the beginning of 2013 we have been quite consistent in our results, but now we have a big week in front of us starting with Everton and we have to show we have the hunger and the quality to do it."
