Leeds United’s £13 million bid for Sheffield United star Gustavo Hamer is hopefully a sign of the club’s ambition during the remaining days of the transfer window. The Whites are said to have seen an opening offer turned down by their Championship counterparts, who will clearly be keen to avoid selling one of their best players to a divisional rival. Hamer was someone Leeds actually targeted 12 months ago when he was still at Coventry City, though he opted for a move to the Blades with them in the Premier League at the time. Midfield is one of three positions Leeds are still looking to strengt…