According to multiple reports, R. Sociedad are in formal negotiations with Union Berlin over the signing of Diogo Leite. The defender has been a target for some time, and talks are said to be intensifying as the window progresses. The player remains under contract, but movement looks increasingly likely the longer talks go on. Besiktas, Frankfurt and Everton remain in the background, but for now, R. Sociedad are leading the way in ongoing talks. This season (25/26) R. Sociedad have shipped 56 goals in 36 matches - 1.56 a game, which is well above the LaLiga average. Diogo Leite would be expected to come in and help tighten things up at the back. There are currently no rumoured links for either Union Berlin or R. Sociedad. Can't get enough R. Sociedad transfer rumours? Follow @PlayerSwitchCom on Twitter for the latest transfer news as it happens.