Allardyce has recently been appointed as Sunderland boss, and McClaren believes that he will already be assessing which players are committed to the Black Cats cause.
And, finding out the players who will put their all in for the club is something McClaren claims he has quickly had to figure out during his time at St. James' Park.
“Players at every club are, unless they’ve got a huge contract, but even then," he said.
“We want players here who are committed to what we’re trying to do, who are committed to Newcastle and the dressing-room and the whole club and the fans and that’s going into any club.
“Sam (Allardyce) will be doing exactly the same over at Sunderland: who is with me, who is not?
“That’s what we’re doing here. Who is with us, who is not?”
McClaren's search to find the committed Newcastle players has not yet been finalised, with the former England boss struggling to help his side pick up points.
The Magpies have still not won a Premier League fixture to date this term, with their fragile confidence being exposed on numerous occasions.
It has been a similar story at North East rivals Sunderland, with the Black Cats falling to defeat in five of their first eight matches.
They will hope that Allardyce's appointment improves their form, though, with the 60-year-old boss taking charge of his first game this weekend against West Bromwich Albion.