Pep Guardiola vowed his Manchester City side would "breathe down the neck of Arsenal" earlier this month and now his side have closed the gap after they beat Fulham this week.
Arsenal dropped point to Brentford in a 1-1 draw that was one of the Gunners’ worst performances of the season under manager Mikel Arteta.
Arteta’s side will only put more pressure themselves by failing to pick up 3 points against sides like Brentford as the gap between them and City gets tighter.
Speaking to Betfair, Shearer has warned the North London side that they have a real battle on their hands as they chase down their first title in over two decades.
“Man City know what they're doing. Most of their players have been there before, seen it, done it and know what's coming and what to expect.
“If you're going to win the Premier League, then it's not that often that it's going to be at a canter. I know Liverpool did it last season, but because of Arsenal's desire and hunger and all of those things, then they're going to have to do it the hard way.
“I wouldn't say there were cracks with Arsenal. I guess, because of City's form, it would be no surprise now if City went on a really good run. We've seen it before with Pep. It's about the time that they go on a run, so we wouldn't be surprised. But cracks, no. Not yet. I think Arsenal are still in a really strong position.
“I wouldn't say cracks aren’t there yet, but it's going to be an interesting three or four weeks for Arsenal.”
Arsenal have won two their last six league matches and fans are starting to worry that their lead at the top could be cut even shorter as they prepare to face rivals Tottenham next weekend on a new manager bounce.