Horrible knee pain after not playing for years, normal?

So I've played 11 aside football most of my life on a quite decent level, and someone convinced me to trial for a futsal team. I've played futsal years ago, so I know my way around. With that being said it went really well, but ever since the trials I have had very bad knee problems (probably because I'm not used to playing on the firm ground). It has been 5 days since the trials and it's still quite bad. Has anyone else experienced that? Obviously I'm trying to ice it and rest but I'm a bit anxious that this will take me out for a bit longer. I'm fine once I start to run etc but the pain afterwards is horrible, I can't even walk properly.

Is this a normal thing for regular futsal players or people who haven't played in a while? Don't wanna miss the start of the season next week.