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Midfielder Jack Wilshere has announced he will leave Arsenal when his contract expires at the end of the month.

The 26-year-old, who has been with the Gunners since joining their academy in 2001, said he was "left with little choice" following discussions with the club, including new manager Unai Emery.

"I can confirm I will be leaving Arsenal Football Club when my contract expires at the end of June," Wilshere wrote on Instagram.

"Following a number of extensive conversations with those at the club, and in particular a recent meeting with the new manager Unai Emery, I felt that I was ultimately left with little choice but to make the decision that I have due to purely footballing reasons."

West Ham have announced the club-record signing of Toulouse defender Issa Diop on a five-year contract.

The 21-year-old centre-back joins the Hammers for an undisclosed fee, reported to be £22million.

"I am very happy to sign for such a historic English club, and I hope to show my best here," said the France Under-21 international.

"I am a very ambitious player and West Ham is a very ambitious club, as we've seen with the appointment of the new coach. I hope to help the team win lots of games and make the fans happy."

New boss Manuel Pellegrini has already brought in Fulham full-back Ryan Fredericks this summer as he attempts to bolster the club's defensive ranks.