The Swedish forward endured a difficult first campaign at Anfield after completing a British-record transfer from Newcastle United.
Despite those struggles, Sheringham is confident the striker can rediscover the form that made him one of Europe’s most sought-after forwards and justified his reported £125 million valuation less than a year ago.
"Alexander Isak could have a massive say on the Premier League next season," he told the ECHO, via ComeOn.
"I loved him when he was playing for Newcastle United, firing on all cylinders. He’s definitely a player who can make the difference but he’s had a tough year.
"Injuries like that really do set you back but hopefully he’ll come into next season in good form. I was going to say I hope he has a good pre-season for Liverpool but he’s getting that with Sweden at the World Cup.
"He has a long time to get himself back on track and in shape for Liverpool this summer and hopefully for his sake he'll be back to the player that he was for Newcastle. That's what the Liverpool fans want to see."