Manchester City are planning a further £20m bid for Alexis Sanchez in January. And that could come as a boost to AC Milan, who are monitoring Sergio Aguero's situation at the Etihad Stadium ahead of a potential winter swoop for the Argentinian. Sanchez has been a long-term target for City manager Pep Guardiola, who wants to bolster his stunning forward line. They are already the top scorers in the Premier League. His arrival would raise questions over Aguero's place in the squad - and it was understood that Guardiola was willing to let the 29-year-old leave. Aguero has already scored seven goals in eight appearances for City this season, leaving him on the cusp of matching Erik Brook's record of 177 goals for the team in blue.