The Danish centre-back believed he badly injured his knee when he and Johnson accidentally clashed in the 2-1 loss to Manchester United but he was thrilled that he was cleared of any serious damage allowing him to play in the weekend's 5-2 win over Norwich City.
"I feared the worst when it happened. When I tried to get up the muscle in my knee just didn't work. I felt really unsteady and the medical staff thought I had done my ligaments," he told the Liverpool Echo.
"I thought it was a bad one and that I would be out for months. But, thankfully, it was just a really hard knock to the knee.
"I only started training again last Friday but I was fine for the Norwich game.
"I felt really comfortable and I'm enjoying it. I think I deserved a bit of luck after the problems I've had in the past."