ACL reconstruction - can i play football now?

Basically i had an acl reconstruction exactly a year a go today and was told i should be able to start playing football a year after the op. i played the last 10 minutes of the match last weekend and although i didnt really do much (couple of short sprints and clearences) my knee went quite stiff after the game and had a bit of swelling too. is this normal or would this suggest there could be a problem? also i have slmost full flexion compared to my good knee however its not quite there and if i try to force my knee in to full flexion i get a small amount of pain. past experiences or advice will be much appreciated!! thanks =]