Thierry Henry has spoken about how close Arsenal came to missing out on their 'Invincibles' season.

The Gunners great is the subject of a brand-new documentary - 'Arsenal Legends: Thierry Henry' - which is now available for download on iTunes (UK only).

The Frenchman was a key figure in the Arsenal side that completed an unbeaten season in 2003/04 after clinching the Premier League title at Tottenham.

It's like a boxer, a boxer doesn't go in the ring just to have fun. You go out there to kill and that was our mentality

Thierry Henry

And he admits that it was tough to maintain the hunger to make history after securing top spot - even in the final game of the season against Leicester City.

"The main thing is to be champions," Henry says in the documentary.

"You still have six or five games to go and I remember the boss coming in every morning saying 'guys you are maybe going to be able to something amazing. Are you realising?'

"We were like 'we're champions man, come on!'. It's like a boxer, a boxer doesn't go in the ring just to have fun. You go out there to kill and that was our mentality.

"Suddenly I remember Patrick [Vieira] looking at me and he was like 'There is no fight, I need have the fight, I need to know that we need to get some points.

"We were not realising what was happening. They [Leicester] go 1-0 up and suddenly you wake up and hope it won't be too late, because you know in this type of game you can hit the crossbar or the post and you can never come back.

"Somehow we came back into it [to win 2-1], and what a finish, I think the skipper scoring the winning goal was the cherry on the cake.

"We had a lot of players that were doing what the game was asking. Winning the Double, it is amazing, but going a season unbeaten, it is an achievement."

Copyright 2014 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source Chris Harris 17 Dec 2013