Arsenal have strengthened their defence ahead of the new Premier League season.

Calum Chambers has joined from Southampton on a long-term contract for an undisclosed fee which is believed to be £16 million (€20 million).

Here's @CalumChambers95 with new @Arsenal team-mate @theowalcott. See more Chambers pictures: http://t.co/duPxUeZWhf pic.twitter.com/8Jnhzyx2Rj

— Arsenal FC (@Arsenal) July 28, 2014

Like Theo Walcott and Alex Oxlade-Chamberlain, he is another graduate from the south coast club's academy and made his top flight debut on the opening day of the last campaign - and featured 22 times in the league.

"We are very pleased that Calum has agreed to join us. The way he adapted to the Premier League last season with Southampton at a young age shows that he has tremendous quality. He has a lot of the attributes that we look for in a young player and I am sure that he will do well with us," said manager Arsene Wenger.

Chambers' versatility means he can play at right back, central defence and also further forward.

He joins Alexis Sanchez, goalkeeper David Ospina and Mathieu Debuchy as a new arrival at the Emirates.