Lonergan replaced Robert Green as Leeds' second choice between the sticks at the end of the summer transfer window, and is awaiting his second debut for the club at which he spent one season at the start of the decade.
But according to his manager, Christiansen, the Preston born player could make it 25 miles from his hometown, in Burnley.
"I have thought about it (making changes)," the Dane told Leeds' official Facebook account on Monday. "Perhaps there will be some changes.
"(Bringing in Lonergan is) one of the possibilities in the team, they (Lonergan and Felix Wiedwald, Leeds' first choice goalkeeper) will both travel."
Leeds looked to have a defensive crisis on their hands, with Pontus Jansson limping out of Saturday's 1-0 Championship defeat against Millwall.
Fellow centre-backs Liam Cooper and Matthew Pennington had already been forced to miss the Whites' trip to the Den, but Christiansen hasn't ruled out the latter pair returning at Turf Moor.
"Liam is doing very well," he added. "Pontus it's nothing really important and Matthew Pennington trained for the first time with the whole squad today so it's positive.
"We will see (if it's too early). They are with us so if they will be ready will see."
When pressed on Jansson specifically, Christiansen replied: "The physios and the doctor will come out with some news, but it's not something serious.
"He will stay (behind)."
Former Leeds pair Chris Wood and Charlie Taylor could feature against their old side for Burnley.
Would you start Lonergan on Tuesday?