When the next major tournament starts, Walker will be 36 and Trippier will be 35. No guarantee that either of them will be playing at the very top level at that point. Will also depend on how the new manager wants to play. If he's playing with a flat back 4, I'd expect White to be involved (if he chooses to) along with Reece James (injury record permitting) but if we go to a 3 with wing-backs, I'd imagine TAA would be in pole position.