Souness said: "It's an absolute nightmare for him. He's come over here, been great for three weeks, working morning and night to get fit, and this is just a tragedy for him.
"I'm so sad for him - on Saturday night I didn't even think about the game because I was so sad for him, especially to be injured in such a freak way.
"But he doesn't need an operation and he will be wearing a Blackburn shirt in eight weeks - inshallah!", he added, using the Moslem phrase for 'God willing'.