No less than 12 England players were involved in some respect Down Under with replacements Brad Barritt, Alex Corbisiero, Billy Twelvetrees and Christian Wade joining Dan Cole, Tom Croft, Owen Farrell, Geoff Parling, Manu Tuilagi, Mako Vunipola, Ben Youngs and Tom Youngs.
And after coming together to chat about what they all have learned from their time on a success Lions tour, Rowntree believes it can only benefit the national set-up.
"The Lions players were only there for the last day [England training at Loughborough University] and didn't do any physical stuff," he said. "But everyone else had gone home and they spoke to us as coaches about what they had learnt on tour and about the differences in environment.
"The lads were able to grade themselves not just on the field but off the field, too. We learnt how a lot of those other nations are very diligent in their off-the-field homework, analysing training and analysing games. It was good for our lads to see that."
"It will be massive. It was such a positive experience in terms of the levels the players now know they have got to aspire to be with the best in the world."