The former Celtic striker has been impressed by one key aspect of the Bhoys' play.
After their recent injury setback West Ham United must do everything they can to sign the Manchester United player this summer.
Leeds United had over 17,000 spectators for their pre-season friendly game against Everton at Elland Road earlier today.
Billy Sharp re-joined the Yorkshire club from rivals Leeds United recently.
The 24-year-old opened the scoring for the Bhoys on Saturday afternoon.
Alex Lopez featured in a pre-season friendly for Championship outfit Sheffield Wednesday at Hillsborough earlier today.
West Ham United could only draw 2-2 with the Romanians at Upton Park.
Derby County beat Burton Albion 3-1 at the Pirelli Stadium.
Scott Sinclair bagged a hat-trick as Tim Sherwood's side were held to a 3-3 draw at Forest in their final pre-season encounter.
Stoke City have made further improvements this summer.