Toon midfielder Scott Parker has been widely tipped to succeed Shearer as captain although Shay Given steered United through the last few games of the season after Parker contracted glandular fever.
However, some think Roeder is waiting to see if he can get Sol Campbell from the clutches of a host of Italian clubs, before making his mind up.
Roeder: "We need a new captain now Alan has retired but nothing has been decided for sure.
"I like the idea of a club captain and a team captain at Newcastle, and when people return from holiday things will finally be decided and those the people concerned will be told before it becomes public knowledge.
"Scott is an obvious contender but I do not want to make decisions like this too soon - we still aren't out of May yet."