“For me this is a final for the Premier League; if Chelsea beat Arsenal it's done, the Premier League.”
But defeat at Stamford Bridge on Saturday would end Arsenal’s dreams this season, the Frenchman believes, especially after a 2-1 home defeat by Watford on Tuesday left Arsene Wenger’s side nine points behind the leaders.
However, Pires also believes an Arsenal victory after four defeats in a row at Chelsea would throw the title race wide open again.
“If Arsenal beat Chelsea at Stamford Bridge, anything is possible because Arsenal are getting close to Chelsea," he said.
To do that Pires sees one duel as a factor.
“The key for this game is the battle between Laurent Koscielny and Diego Costa,” he said. “Koscielny is one of the best in the Premier League. Diego Costa loves to defend the ball, loves the fight and is a very good striker. So this is the key at Stamford Bridge: Koscielny v Costa.”
Marcel Desailly would have relished being in Koscielny’s boots on Saturday.
“Diego Costa wants to fight, want to compete. He was the kind of player I liked to play against,” the former Chelsea defender said.
But he believes the Blues’ main strength lies in their organisation, rather than individual brilliance.
While Desailly also sees Saturday’s match as “very, very important for the title” he says the players should focus on the here and now.
“There's only one pressure that we [players] don't cope with, the pressure of knowing you are going to potentially win the league,” he said. “The coach has to work very hard on you to be able to remove this, and make your objectives nearby.
“Otherwise, you look too far away and put yourself in trouble.”
Robert Pires and Marcel Desailly were speaking at the TAG Heuer Premier League Pressure Test. TAG Heuer is the first ever Official Timekeeper and Official Watch of the Premier League.