According to multiple sources, negotiations are underway regarding Diogo Leite, with Frankfurt keen to finalise a deal with Union Berlin as they look to strengthen their squad for the run-in. The defender has emerged as a top transfer target in recent weeks, and the player's representatives are also believed to be involved in early discussions on personal terms. Whether a deal can be struck remains to be seen, but there is increasing optimism that the transfer could go through in the coming days. Besiktas, Everton and R. Sociedad have not withdrawn their interest and could still influence the outcome. So far in this season, Frankfurt are conceding 1.91 goals a game (63 in 33), more than they'd like compared to the Bundesliga standard. The hope is Diogo Leite adds a bit of steel and helps make them tougher to break down. Reports suggest Frankfurt are monitoring Patrick Wimmer whereas Union Berlin have not been associated with other players at this stage. Follow for more transfer rumours ahead of the Transfer Window!