Manchester United signings Anderson, Nani and Owen Hargreaves will all play today against Peterborough.
United boss Sir Alex Ferguson faxed his squad list to Posh director of football Barry Fry - and the names included Hargreaves, Anderson and Nani.
Fry said: "I was stunned when I saw those three on the fax - along with names such as Mikael Silvestre, Darren Fletcher, Tomasz Kuszczak, Phil Bardsley, Gerard Pique and up and coming Lee Martin.
"You always trust Fergie to support football's small fry and we're delighted. That should ensure a full house."
Anderson made his United debut in last night's 2-0 win at Doncaster. Darron Gibson and Sean Evans netted as Anderson tip-toed his way through a half.