Gustavo Hamer has now emerged as a late target for Leeds United after Sheffield United rejected the club’s opening offer, but the Blades are willing to do business with the Whites again. The crossover between Leeds and Chris Wilder’s side this season has been regular. Jamie Shackleton left Leeds for Bramall Lane, before Leeds agreed a bargain £5m fee to sign Jayden Bogle a few weeks later. Alfie Gilchrist and Jesurun Rak-Sakyi are both new signings at Sheffield United after being targeted by Leeds over the course of the summer. Now, Leeds want to raid Wilder’s side a second time for Hamer. The…