Atletico have opened talks with Marseille over the potential transfer of Mason Greenwood, who currently plays as a forward. Negotiations are active and ongoing after an opening bid was submitted, though there is reportedly still some distance between the clubs on valuation. However, discussions are said to remain open and constructive - as both sides explore whether there is a deal to be done. Atletico remain optimistic, but the deal is not without hurdles. Fenerbahce, Arsenal and Roma continue to monitor developments and could yet re-enter the race if negotiations stall or valuation gaps remain unresolved. Atletico have been strong going forward this season, with 43 goals scored in 26 games (1.65 per game). Mason Greenwood would give them depth and keep that attacking firepower going all season. Reports suggest Atletico are monitoring Morten Hjulmand, Alex Grimaldo and Kang In Lee whereas Marseille have not been associated with other players at this stage. Can't get enough Atletico transfer rumours? Follow @PlayerSwitchCom on Twitter for the latest transfer news as it happens.