West Brom boss Robson believes that only Manchester United can pose a genuine threat to reigning champions Chelsea during 2005-06.
Robson, whose side were beaten 4-0 at Stamford Bridge in midweek, told PA Sport: "I do genuinely think that only Manchester United are capable of challenging Chelsea now. In all honesty I believe Vieira and Edu are massive losses for Arsenal. I just think Arsenal have lost a little bit of strength in the midfield area and do think they will fall down a bit because of that situation."
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