I wouldn't advocate "freshening up" the team just for the sake doing so, but Puel should pick the player mix that he feels is best placed to beat Watford. All opponents we play have different strengths and weaknesses. To blindly pick the same team simply because they played well in a final is sentiment over logic. Yes, I think his aim should be to maintain as much of the team that played so well on Sunday, but not just for the sake of doing so. I would start Cáceres (for Stephens) and Boufal (for Tadic) vs Watford as I think that will make us an even better team than the one that started vs Man Utd.