Rotherham look for loan boost
And without the pair the Yorkshire side rarely threatened against Chesterfield on Saturday.
Knill, a former Scunthorpe centre-back, admitted the home loss to the Spireites was the worst display of his side's season but knows he is limited in his bid to strengthen the Rotherham squad.
"There is no money to buy anyone so any signing will have to be on loan," he said.
"It's going to be tough but we just have to get on with it."