Definitely, they'll have been training in good conditions back home and I imagine they're amongst the 2 naturally fittest players in the team, well used to playing a full 80 minutes each week.
I think they'll come back supercharged, raring to go and prove themselves ready for the fight, and landing back in the UK with more favourable weather conditions than a week or so back, in the depths of winter.
My only slight concern is, they do come back, with all the stuff globally going on.