I come in contact with mostly American football player's and other athletes. I can't suggest strongly enought that your medial ligament may need a good amount of rest, for at least a week or two week. Else the other three main ligaments around the knee joint are put under too much stress, causing more problems. May want to take a layoff of doing any direct leg exercises for the moment, even with moderate weight. If getting playing time in on saturday, hopefully your coach is aware of your limitations on that one leg. If you use tape before a match, than you may have someone apply that around the knee area.
Everything might build a certain amount of limited mass but not over whelming mass. Compound exercises tend to build the most pure muscle mass in the shortest period of time. Going to failure while having a potentional ligament strain may not be the best of idea's. Going to failure, with even a healthy body, is not always a good idea in regular workouts. As WOOO suggested, leg extensions can be rewarding. But try avoiding full lockouts at the top position. Leg extensions are usually done as a full warm-up motion or in a pre-exhaust leg work. One leg at a time is also a good idea. Will tend to balance out the strength of both legs. As step-ups are also a good idea for equal leg strength balance for athelets. Good Luck.
