Next two games will test Sounders’ depth to extreme

“Play your kids” is a phrase used in American soccer to advocate for Major League Soccer teams to get their more promising young prospects on the field playing with — and against — players with significantly more experience, in the hopes of accelerating their development.

Seattle Sounders head coach Brian Schmetzer may be about to put that philosophy into action over the next two games even more than he’d like.

The Sounders’ list of unavailable players — due to a combination of injuries, international call-ups and suspension — has reached a level heretofore unseen in the club’s history. And in the middle of a three -game stretch in eight days, Schmetzer is likely going to have to come up with…