The USL Pro-League side have secured the services of the SKC pair as part of the affiliation between the two clubs.
24-year old forward Sapong and 22-year old right-back Ellis will go straight into Adrian Heath's Lions squad with the best wishes of SKC head coach Peter Vermes.
"This isn't a demotion," Vermes said.
"This is an opportunity. A demotion is when you get cut from the team. This is an opportunity for those guys to get serious minutes of play in an extremely competitive environment, so that when they do come back here they are in form and in a routine."