Liverpool captain Virgil van Dijk has major sympathy for Joel Matip over his knee injury.
Van Dijk suffered a similar injury 18 months ago.
He told France Football: "Doubts only occurred in the aftermath of the operation.
I had a lot of time to think and reflect. I did not sleep well. I was tired and in pain.
I also heard that 75% of players suffering from an ACL injury had struggled to return to their form. I have done my research and I worked to recover my level.
I never gave up and I knew I was getting there. Today, I returned to where I wanted to be. I'm the same player as before.
He continued: I felt awful for him (Matip). I know exactly what he will go through. He's a great lad. I want to be there for him as much as possible.
I'm this way because of everything I went through. To feel and think about others is something that should be normal in life."