A top ex Premier League star has tipped West Ham’s Luis Guilherme to be a sensation after playing against him in Brazil. The Hammers stated they were “excited” by the capture of Brazilian teenager Luis Guilherme from Palmeiras when they unveiled him. Guilherme became the first signing of the post David Moyes era at West Ham at a reported £25m all in. The move is a clear change in transfer policy and strategy with technical director Tim Steidten taking full control. West Ham fans have also been excited about the signing of the Brazil Under 20 star given Steidten’s track record. However, until a…