Henry has sympathy for Arteta for the timing of football's postponement, insisting he was getting them to a good place, and also says the club have to give him time to instil his methods at the Emirates.
The Montreal Impact coach told Sky Sports: "It's a tough one because Mikel Arteta was getting them to a certain place, you could see the organisation, they were more compact, difficult to beat and then this happened.
"I can tell you as a coach now, it's not easy to deal with because you want to carry on with what you're doing and even though you are talking to the players, it is better to train to see what you can do at the weekend. It depends on who is going to leave or who is not going to leave, we don't know about that, who is going to come in also.
"I just want Arsenal to do well and make sure they can compete and I wish them all the best all the time and Mikel Arteta too because that's a tough job as everyone knows but we have to give him time."