After what has turned out to be a roller coaster of a transfer saga, Alexis Sanchez is reportedly set to stun the world on deadline day, by completing a move to one of Arsenal's English Premier League rivals Manchester City.An image of Alexis Sanchez in a City jersey has emerged on social media, with a green screen in the background, suggesting that the Manchester club are gearing up to unveil the Chilean.With just hours left until the transfer window shuts, Twitter has been sent into a dizzying frenzy by the speculation.Leaked Picture of #alexissanchez Posing in #ManchesterCity's Jersey ? pic.twitter.com/JlgA6545id— abderrezak kadaoui (@abderrezakkad) August 31, 2017Alexis Sanchez allegedly pictured in Manchester City kit after telling team-mates he’s leaving Arsenal (Photos) -... https://t.co/OUPNw4O4fw— GurusLoaded (@GLoadedAgent) August 31, 2017Alexis Sanchez on the Airport today! #arsenal #ManchesterCity #DeadlineDay #Sanchez #Alexis pic.twitter.com/XKxKDJKPPx— C (@CTwiter10) August 31, 2017While some fans are indulging in speculation, others have already begun reacting to the news that Sanchez will soon be a Citizen.News seems to be breaking thick and fast that the deal is all but done, and the Twitterati certainly seem to be doing their bit#Arsenal have accepted #manchestercity £60m offer for #alexissanchez (Mirror)Happy with that Arsenal fans?#DeadineDay— WarLFC (@UsmanMK91) August 31, 2017Arsenal accept Manchester City's £60million offer for Alexis Sanchez as Gunners lodge bid to... https://t.co/9AG5Zhkz8j via @arsenalnewspro pic.twitter.com/WWAw252v3c— Arsenal News (@ArsenalNewsPro) August 31, 2017Arsenal star man, Alexis Sanchez is closer now more than ever to a Manchester City switch. - Meldo Sources.— Meldo (@Meldo_10) August 31, 2017Arsenal's transfer window seems to be going from bad to worse, as their best player is on his way out of the club, and Arsenal fans have taken to Twitter to express their disappointment.No lie I'll be sad if Sanchez joins Man City because we are strengthening are rivals ?— Rubz (@RubellM) August 31, 2017Arsenal need their head checked ?Sanchez to city and ox to Liverpool!! I thought Spurs were the selling club ?— Ian (@ianpollard840) August 31, 2017Conversely, Manchester City fans couldn't be happier and seem to be taking over Twitter.Waking up to an Alexis Sanchez signing for City just made my entire day— Jorden Alfery (@jalfery31) August 31, 2017Two years and the chase for Alexis Sanchez to Manchester city is finally over!!! @ManCity #LetsGoooo— Don P (@itsPena_) August 31, 2017Daily star apperantly Sanchez has told his team mates he's a man city player (or thereabouts)— Little miss zlatan (@lynnmott11) August 31, 2017Several Twitter users are already heralding the Chilean's arrival, despite no formal announcement being made yet. Other users took to Twitter to urge Manchester City to announce the signing at the soonest.ALEXIS SANCHEZ TO MANCHESTER CITY.— ali Z (@originalAZee) August 31, 2017Come on City make Alexis Sanchez official already !!— Ferny? (@just_fern23) August 31, 2017I'll be shocked if City don't wrap up Alexis Sanchez in the coming hours.1.85 still available with some books seems generous— Bookie Insiders (@Bookieinsiders) August 31, 2017Actually think Sanchez will be done regardless of them signing a replacement. We'll just end up paying an extra £5m to £10m.— Sean (@City_Sean) August 31, 2017Meanwhile, others are simply waiting for the imminent hubbub expected to accompany the transfer, while also stressing on how formidable the Manchester City squad will become, following the addition of Alexis Sanchez.Sanchez has actually signed for City...and most of Arsenal twitter are sleep. The meltdown that's about to ensue...I cannot wait— ??? ?????? (@AbdxlA) August 31, 2017I really hope Arsenal don't sell Sanchez to City. It'd most likely confirm City to lift the title if they get him.— Opeyemii (@KingYemii) August 31, 2017Should Manchester City announce the signing of Alexis Sanchez in the coming hours, it most definitely will be considered one of the best signings of the summer, and Pep Guardiola and his side are bound to be on tenterhooks for the next few hours.