With both Arsenal and Chelsea posting good results in recent weeks, the battle for Champions League qualification has intensified with only nine games remaining.
We currently trail the Gunners by one point but lead Chelsea by five, making Saturday's fixture at Stamford Bridge a vital game for both teams.
Harry admits that the lads were not at their best against Stoke on Wednesday but believes that whatever the result against Chelsea, the battle to qualify for European club football's elite tournament will go down to the wire.
"I thought we played ever so well in the Everton and Manchester United games, I don't think we played as well against Stoke, but they're not easy opposition to break down," the manager told his pre-match press conference on Friday.
"We want to get something from the game tomorrow. If we can come away with the five point (lead over Chelsea) still intact, that will be important for us.
"As I say, there's a long way to go and lots of twists and turns ahead. It's not over yet."