Arsenal manager Arsene Wenger acknowledged Leicester City as potential Premier League champions after they showed "special force" to beat fellow challengers Manchester City last weekend.
The Foxes travel to face the Gunners on Sunday and go into the weekend five points clear at the top of the table.
Arsenal are third behind local rivals Tottenham on goal difference, while City are only a point further back in fourth.
But, if Leicester can mastermind another memorable win this weekend they will remain on course for one of the most surprising title successes in the sport's history.
Wenger has long admitted that Claudio Ranieri's men are in the title picture, but said their 3-1 display against City last Saturday has shown they are ready to go all the way.
"They had a decisive test against Liverpool and City," he said. "If they had lost you would have said no, they can't do it. But these two games were the turning point in their season.
"(Against City) they had a kind of dominance and belief in every challenge, that special force where teams get into a zone where teams think: 'we can do this'."
Leicester have only lost twice in the league all season, the first a 5-2 defeat to the Gunners at the King Power Stadium back in September.
Since then they have only lost at Anfield to Liverpool on Boxing Day and Wenger admits he sees a different Leicester side now to the one his men dismantled almost five months earlier.
"They are more cautious at the moment," he said.
"They play a lot in their final third and come out very quickly. Look at the number of direct balls from their half to the opponents' half.
"They are higher than anyone else because they have Jamie Vardy on his way straight away when they win it. They do it very well. They suck you in and go very quickly in the opponents' half.
"At the time (of the 5-2) they were a bit more all going forward. Today they are a bit more 'let's sit here and use our strengths in a very efficient way', which is what they did remarkably well against Man City."