Arsenal's goalkeeper Petr Čech has announced he'll retire at the end of the season. Here's his tweet: "This is my 20th season as a professional player and it has been 20 years since I signed my first professional contract, so it feels like the right time to announce that I will retire at the end of the season. Having played 15 years in the Premier League, and won every single trophy possible, I feel like I have achieved everything I set out to achieve. I will continue to work hard at Arsenal to hopefully win one more trophy this season, then I am looking forward to seeing what life holds for me off the pitch".
