Spurs lost to Jurgen Klopp's side in the Champions League final last week.
"It's not draining coming to play for your country," he said.
"It is a bit draining having lost last weekend and having to share the camp with Liverpool players. You are reminded every day that you lost the final and that was a unique experience for me.
"I have never been through that myself. I was definitely tired from a long season with my club and having to come to England didn't help.
"But as I said, whenever you're selected for England it is a great occasion. It is one I will always welcome and cherish."