The Gunners legend believes victory over Jose Mourinho's side would cause them concern in the title race.
The Gunners beat Burnley 1-0 on Sunday to move within four points of Jose Mourinho’s side at the top of the table, although the Blues do have two games in hand.
The first of those spare games is against QPR on Sunday, with the two London sides then meeting each other at the Emirates once Arsenal have dealt with an FA Cup semi-final against Reading. As far as Henry is concerned, if his old side can win that game then Chelsea will be worried.
“If they beat Chelsea, they will put some doubt in their mind,” he said on Saturday Night Football.
The win over Burnley was Arsene Wenger’s team’s eighth victory on the trot in the Premier League, a run that has seen them surge up the table into second place.
Henry admits that they would need to win every game until the end of the season to mount a late title challenge, but says that their current form is down to players having to perform in roles they may not enjoy for the overall good of the team.
“There is one thing I want to go back to, what Aaron Ramsey said,” he added.
“He said that he doesn't like it much playing on the right of midfield. But this will do a job for the team. The run they are on is because they are doing things they don’t like, but they do it for the team.”