Think we'll need to if we're looking for clean sheets.
He's a "proper defender" in the Jags style , so the perfect partner for Stones in that he's happy to let Stones go waltzing forward and provide  the cover, knows his limitations and where he can plays the simple ball, even if it goes backwards.
This is where I worry about the quality of our back room staff, without wishing to turn this into a fume thread. They should be working with him on defensive drills all week , talking about positioning when defending, what he does when Stones goes forwards, where he positions himself at corners etc. Ironically probably the best person to do this is Jagielka, get him involved in helping the lad. Forget about the nonsense of needing 50/100 games , 1000 training hours or whatever just give him practical support and help him to perform to his best.