Lambert is looking for new players but the club's finances are restricted since they fell out of the Championship.
He told the East Anglian Daily Times: "I am trying to get a few more in, though the club does not have the same finances in the past when they were in the Championship.
"It will probably be a case of recruiting some players through season-long loans, and others through joining us."
Meanwhile, Colchester's League One clash at Brighton has been moved back 24 hours to Friday, December 11 with a 7.45pm kick-off.
Source: Team_Talk