The pair returned to pre-season training on Monday, a week after their teammates. Both were granted an extended break after their international committments.
Klopp said: "It was good to see them – they looked well recovered, I would say! Adam's hair has grown a little bit again… I hadn't seen him for six or seven weeks.
"Phil looks good also, so it's always good – an outstanding player and having him not around feels a little bit strange, but having him around feels much better!
"Pretty much all of the players will play at Tranmere. Of course, not Adam and Phil – they only arrived on Tuesday and they have to train now, then we will see how far they are before the game at Wigan.
"It is not even sure we will try this, so then for sure in Asia they will be a part of the line-up."