Arsenal have signed full-back Mathieu Debuchy from Newcastle for a fee believed to be around £12million.
The 28-year-old will replace Bacary Sagna, who earlier this summer left Arsenal to join Manchester City on a free transfer.
A post on Arsenal's official Twitter feed read: "It's official - Mathieu Debuchy has signed for @Arsenal!"
Debuchy: "I know that Arsenal can win titles every year.
"Winning the FA Cup last season was something magnificent, but I hope that it is just the beginning and that there will be more to come next season.
"There are some really great players in this team. We saw that last season and I think it will be even better this season.
"I hope there is more silverware to come in the next few years.
"The settling-in period will be easier. I have been playing in the Premier League for a year-and-a-half now, so I already know it well, so that will be in my favour."
"Newcastle was an extraordinary experience at a club with great fans.
" I thank them from the bottom of my heart because they really supported me during my time there and I hope they understand that I had a huge opportunity which I simply could not refuse.
"Playing again in the Champions League is a big excitement for me and I will do my best to help Arsenal compete for trophies."