if he already 79%
1. don't accept friend gift that raise/gain ability it risky
2. don't play him. when he play you risk him to gain ability from MVP bonus.
3. bench him and feed him green until he gain SA.

if he still below 79% example 77 or 78% you can play him and accept gift.

so next time don't keep him at 79% if you want he gain SA at same time. keep him at 78 or 77% instead

or go over here for more detail, this has been dicussed before just search it and good luck .

https://forum.topeleven.com/tutorials-guides/