[glandular fever], Since it is a virus infection, you cannot treat it with medicine, it will require 4-8 weeks for full recovery [since he is asymptomatic]
2. check for LFT [liver
3. because your son is a football player, make sure he starts playing sport very slowly, because his muscles will not be ready yet and too much physical activity can increase chance for relapse and other diseases.So make sure he get enough rest.
. [fatigue] is often the last symptom to go, so he is having the same.
ii. The spleen
usually become normal after about three weeks.However, one study found that in 3 out of 19 people it took eight weeks.Therefore, if you want to be absolutely sure, make sure he should not play or avoid rough or contact sports after having glandular fever.
iii .try to improve the Immune status.