While Christopherson will be keen to impress, he is almost guaranteed to hold the top keeping spot as the Knights look to protect top spot for the remaining three fixtures.
Watling is likely to be out for the remainder of the competition after straining a hamstring while batting in the Knights' thumping 151-run win over Central Districts in New Plymouth on Sunday. The Knights are hopeful of Watling's return in time for the finals, should they make them, but this will be contingent on the severity of the Black Cap's hamstring tear.
The Knights have been the form team of the competition, winning their last four matches, two with a bonus point.
The Knights sit one game and a bonus point clear of the second-placed Canterbury Wizards with three matches left.
Joining Christopherson in the squad for the game, which starts today at 10.30am, is fellow Northlander Brad Wilson, although he may not make the playing XI.