Arsenal midfielder Granit Xhaka is set to leave the club in the summer and fans are outraged.According to transfer expert Fabrizio Romano, Xhaka, 30, will leave the Emirates at the end of the season despite having a year left on his contract. Bayer Leverkusen are in advanced talks to sign him for €15 million. He will be signing a four-year deal with the Bundesliga outfit.Xhaka's departure comes as a shock amid his impressive campaign for the Gunners. He has scored seven goals and provided as many assists in 45 games across competitions. The Swiss international has enjoyed a more advanced role under Mikel Arteta.The midfielder seemed certain to depart the Emirates in 2019 when he swore at supporters. He was stripped of the club's captaincy but has bounced back under Arteta. Xhaka even revealed to BeIN Sports last year how the Gunners boss was instrumental in his decision to stay at the club:"He just said: Stay, I will make sure that you deliver top performances. Please give me six months. He told me his ideas and his philosophy. I just knew it would work out with him. For the first time in my life I made a decision all by myself."However, Xhaka will be leaving Arsenal in the summer, bringing an end to a seven-year stay in north London. He has won the FA Cup twice and made 295 appearances for the club.One fan is bemused by the decision to sell Xhaka as he feels he has been the Gunners' best player this season:"His best season for us and he’s off."Another fan tweeted:"Where is he going so soon? They can try again next year!"Here's how Twitter reacted to the shock news that Xhaka will be leaving Arsenal in the summer:Fabrizio Romano@FabrizioRomanoGranit Xhaka, set to leave Arsenal at the end of the season. No negotiations over new deal and plan to part ways in June. #AFCBayer Leverkusen are in advanced talks to sign him — €15m fee.Understand personal terms are almost agreed over four year deal — June 2027.317403480Granit Xhaka, set to leave Arsenal at the end of the season. No negotiations over new deal and plan to part ways in June. 🚨⚪️🔴 #AFCBayer Leverkusen are in advanced talks to sign him — €15m fee.Understand personal terms are almost agreed over four year deal — June 2027. https://t.co/0MlyJwNwhmRichard Green@RichGreenArena@FabrizioRomano @147Finny his best season for us and he’s off @FabrizioRomano @147Finny his best season for us and he’s off 😅•Nagash✨☦️@nagash_OG@FabrizioRomano Where is he going so soon? They can try again next year! @FabrizioRomano Where is he going so soon? They can try again next year! 😨Carolina Karisa ◑☽@erisriot@FabrizioRomano Tell me this is a dream. I know someday he will leave the club but not this soon. 🥲🥲🥲🥲🥲🥲1@FabrizioRomano Tell me this is a dream. I know someday he will leave the club but not this soon. 🥲🥲🥲🥲🥲🥲Don@abeid_yanga@FabrizioRomano My favorite Arsenal player since Thiery Henry …Adios Legend.9@FabrizioRomano My favorite Arsenal player since Thiery Henry …Adios Legend. https://t.co/f9jNc0A0Aqname 🇦🇺@parakura113@FabrizioRomano Woah what? Why would he leave? He's been pretty good this season and Arsenal are on the up11@FabrizioRomano Woah what? Why would he leave? He's been pretty good this season and Arsenal are on the upArsenal look set to replace Granit Xhaka with West Ham United's Declan RiceDeclan Rice looks likely to be Xhaka's replacement.All the signs point towards West Ham United captain Declan Rice becoming Xhaka's replacement at Arsenal. The Daily Mail reports that the Gunners are preparing to open talks with the Hammers over a £90 million (£103.36 million) deal for the English midfielder.Rice, 24, has been West Ham's protagonist this season, scoring four goals and providing as many assists in 46 matches. He has played a key role in leading the west London outfit to the Europa Conference League semifinals.Arsenal's interest in Rice has increased throughout the season and Arteta appears to be an admirer. The English midfielder also enjoyed an impressive 2022 FIFA World Cup campaign in Qatar. He was at the heart of Gareth Southgate's midfield, pulling the strings alongside Jude Bellingham.