Lallana believes Robertson was unfairly questioned as Liverpool battled through last season.
"People will point to last season and suggest he was not as good for Liverpool. That really irritates me," Lallana, 33, told The Times.
"Firstly, what is that being measured against? Producing 15 Premier League assists from left back a season? Those numbers are out of this world. Incredible. So judging him on that output all the time is ridiculous."
On Robertson leading Scotland today against England, Lallana added: "When I was at Liverpool, you could see how much he invested into going away on international duty; how difficult it was for him at times and how much pressure he put on himself to try and make sure the team delivered to create new history.
"You cannot change anything on your own but he would come back to the club physically drained because, during that week-and-a-half away, he had been trying to ingrain a certain culture within the Scotland camp.
"When you are at Liverpool you are privileged to be part of an elite group. He did not want to be the player at Scotland who expects things done in a certain way to suit him because you are with a set of lads from different clubs with different philosophies.
"But Robbo was intent on driving new standards."