Tottenham's 2-1 comeback win over Swansea on Sunday kept the pressure on Leicester, who beat Norwich 1-0 on Saturday, but Ranieri believes Mauricio Pochettino's men are frontrunners.
Manager Claudio Ranieri has said the run of four matches, starting with West Brom and ending with Crystal Palace on March 19, would tell him much about the title chances of his side.
"But we are enjoying the ride, I speak for everyone when I say we are playing full of confidence as you have seen but 10 games to go is a long way".
The Foxes initially appeared to be struggling to break down their opposition, as was also the case last time out against Norwich City, but they did create another chance to level things up in the 27th minute when Jamie Vardy glanced a header from Mahrez's cross straight into the arms of Ben Foster.
Moving three points clear of the world's richest league was nothing to celebrate for Leicester's despondent players, who wasted a slew of late chances to open a provisional five-point gap over Spurs.
"We want to continue to fight match-after-match, step-by-step, and now our mind is on Newcastle which is another tough match at home".
"I am happy, not that we didn't get the three points - you can't always get the three points - (but) our performance was fantastic".
Kante has missed just three games all season, including both of Leicester's cup defeats, and the club are winless when he has not been involved.
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"It's not important. We do our best, play well, and if someone is over us, we say well done".
The first half at Vicarage Road was tense, with neither team willing to commit too many numbers forward.
Leicester fell behind to a goal by Salomon Rondon in the 11th minute, but roared back when central midfielders Danny Drinkwater and Andy King scored in the 31st and 45th minutes, respectively.
It was Costa's eighth goal in his last 10 league games for Chelsea, who had to fight off a late rally by Norwich after the hosts pulled a goal back through winger Nathan Redmond on 68 minutes.
"Last time I managed a national team it didn't go so well". He recognises that the game might never deliver this opportunity again, that providence has stuck a pin in the football map and come up with Leicester as the season's romantic lead.
"They have got some great players, some firepower up top, but we will be confident as ever".
Leicester felt the pinch of real life on Saturday when they laboured against a team they were expected to mulch.
"I have only seen it from a distance so we will wait until the specialist makes an assessment and then we will let people know".