United have signed Brazilian youngster Anderson, 20-year-old Nani, England international owen Hargreaves and are still looking to signing striker Carlos Tevez.
Yorke told The Sun: “It really looks unstoppable. Last season United played some of their best football in about five years. Ronaldo and Rooney put pace back in the team.
“And you still had the wise old heads of Ryan Giggs and Paul Scholes there too. It proved too much for anyone in the Premiership — and now they have made these signings.
“From what I know about Nani and Anderson it looks like they have another two exciting players.”
