Johnson has endured a tough spell with local Conference North rivals Brackley Town.
Davis said: "I've spoken with Ricky Johnson and now it's down to him. I know other clubs are interested in him with his goal scoring record and we will not be able to compete with some of them on budget.
"But I've told him he will play regularly here and not sit on the bench, Ricky told me he wants a couple of weeks to get 100% fit and then decide what he is going to do."