They will both improve, but for me, last season, Spurs biggest issue was tactical, not a personnel issue.
United was the opposite, they dont have the players, they need players across the board, and yes they have signed a couple of good players, but two players arent going to drag you from from 15th into the Champions League, which is where a club like United need to be, not just for statures sake, but for financial reasons too, given how broke they appear to be.
Fosse's wasn't the only comment that aged really well.
