Kirkland, speaking to the club's official website, said:"I'm positive I'll be back for the start of next season. Dr Steadman is the best in the world so I know I'm going to be in the best possible hands.
"He's treated Ronaldo, Alan Shearer, Patrik Berger and Jamie Redknapp in the past and helped them overcome bad knee injuries. I have every confidence in the people who will be looking after me both here at Liverpool and in America.
"It's a massive blow for me but this is football and these things can happen. You have to take the highs with the lows. Hopefully this will just be a minor setback for me in my career."