This guy below does an incredibly detailed analysis of keepers.Interestingly, as of course there are lots of things to look at, he is 2nd for number of saves. Guess also this is because he is 'busier'.
Allison is 4th.
Most Saves - Premier League Goalkeeper Stats
Test Team Description Translationwww.premierleague.com
Edit: Spurs could be a good shout...could Spurs cash in on Hugo? Although is it really an upgrade? Hmm.
When people talk about xg it's usually only looked at in relation to an attempt on goal but stattos can calculate the xg from any position on the pitch based on the positions of the 22 players on the pitch. This guy essentially looks at every action a keeper makes (saves, catching, distribution, sweeping etc) and then looks at how that action has effected the xg. For example, at the point in which an attacker crosses the ball the xg of that situation might be 0.02 however what is the xg after the keeper has decided what he wants to do and carried out his action?
1. Keeper stays on his line and does nothing - defender heads it clear and xg decreases (+ for the keeper) or an attacker has a free header and the xg increases (- for the keeper).
2. Keeper comes out to claim the cross - he catches the ball safely and xg decreases (+ for the keeper), he attempts to punch the ball clear (could be a positive or negative depending on the outcome) or he fumbles the cross and the opposition have a chance to score (- for the keeper).
This guy will look at what decision the keeper took and the resulting outcome and compare it with the xg at the point of the cross.