Personally I think you are barking up the wrong tree. We started today with Gomes and Gueye in central midfield are you really saying they are not physicaly strong enough.
As a team we weren't physically competitive enough. But it was a collective problem. And I believe it's a mentality issue more than personel. There's been a number of games this season where we simply haven't fought for second balls, or tried to make tackles or win challenges.
The manager takes responsibility. But it's a disgrace that players are wiling to allow their standards to drop so dramatically.