How do Celtic cope without captain McGregor?

Registering just one shot, which was off target, compared to Rangers' 24, Martin O'Neill's resolute side managed to drag themselves to extra time before breaking their rivals' hearts in a dramatic Scottish Cup quarter-final penalty shootout. It will forever be unknown what influence injured captain Callum McGregor would have had on Celtic's performance, but many have suggested his absence played a big part in the lack of control from O'Neill's men. One week on from the 2-2 draw at the same ...