Signed for £125M and £116M respectively, Isak and Wirtz have struggled to find their feet in Merseyside and have been constantly ridiculed for their poor performances under manager Arne Slot.
Liverpool, who were Premier League champions last season, are yet to secure a top-five finish as they track down Champions League football.
Their final game comes this weekend as they face Brentford in a game where Robertson and Mohamed Salah will wave goodbye.
The Scotsman spoke this week about the club’s future and the club’s summer signings who he believes will help guide the side to successful in the years to come after what has been a dire campaign to say the least.
"That is what I want (to be back at their best), that is what the club wants, that is what everyone wants.
"I believe they can be successful again and I wish it was this season and then I would have maybe added a trophy or two onto an already pretty impressive trophy cabinet. But it wasn’t meant to be and next season I think they will be right back at it.
“We bought players (last summer) that we all got excited about and they will all have an unbelievable career at Liverpool. I have no doubt about that. But they are also young.
“I have seen more than enough in training and in games and their attitude that they will be successful.
“But for the future of Liverpool I believe they have more than enough in that changing room to go and achieve more things again.”
Robertson and Salah will leave as club legends and as many worry about the future of the side, the defender may have put some eased the doubts of many supporters ahead of the next campaign.