Arsenal is expected to finalise a deal to sign Borussia Dortmund striker Pierre-Emerick Aubameyang in the next 48 hours, with the German club finally accepting a \u00a355m offer for the Gabon striker. Negotiations for the same have been on a go for past two weeks and the Gunners look pretty confident with the deal. Aubameyang had earlier made clear that he was keen to move to London. A three-and-a-half year contract has been agreed with Gabon forward believed to be worth \u00a3180,000-a-week, though reaching compromise with Dortmund has proved more problematic, as per a report by The Guardian. An Arsenal delegation led by the chief executive Ivan Gazidis and the new head of recruitment Sven Mislintat and Hus Fahmy, who works on player contracts, spent in Westphalia last week, with talks having continued in the period since. Yet, Dortmund have made clear that they must secure a forward replacement for the outgoing Aubameyang before the transfer is formally signed off. Meanwhile, there have been talks with Arsenal over Olivier Giroud which is a separate deal, if agreed, rather than a swap, however, the Frenchman is apparently reluctant to leave London mid-season and could be a chance that he moves to Chelsea. Earlier, Arsenal had a swap deal with Manchester United with the latter signing Chile forward Alexis Sanchez as Henrikh Mkhitaryan arrived at the Emirates. The 29-year-old Sanchez, who was out of contract at Arsenal at the end of the season, has joined the Old Trafford club after local rivals Manchester City had pulled out of the running. Sanchez said: \u201cI am thrilled to be joining the biggest club in the world. The chance to play in this historic stadium and to work with Jose Mourinho was something I could not turn down. \u201cI am very proud to be the first Chilean player ever to play for United\u2019s first team and I hope I can show our fans all around the world why the club wanted to bring me here.\u201d Sanchez missed Arsenal\u2019s 4-1 win over Crystal Palace that weekend to have a medical in Manchester. He would have been available on a free transfer when his contract expired in four months\u2019 time but once City baulked at the amount of money involved in a mid-season deal, United manager Jose Mourinho urged his club to step in.