Given Silvestre's recent injury problems it's a bit of a gamble, but it might quieten down some Gooners who have been calling for some experienced cover... frankly as far as the Premiership is concerned there are few with more experience at the very highest level.
Arsene had this to say:
"We have a strong squad but a young squad. Mikael's versatility, experience and calibre will provide the extra depth we need to reinforce our challenge for honours this season.
Arsene had this to say:
"We have a strong squad but a young squad. Mikael's versatility, experience and calibre will provide the extra depth we need to reinforce our challenge for honours this season.
"His defensive adaptability will serve us well, and it's a big plus that Mikael has top-level experience and a great understanding of football in the Premier League."
The player himself said:
"I've spent a large part of my career at United and I'll remember that time fondly but feel I'm ready for a new challenge. Arsenal are known for playing technical and skilful football, and have a young but experienced squad.
"I'm really excited about this next stage of my career, hopefully playing my part in helping the club to new successes."