Jason Kelce's retirement might not last very long -- TMZ Sports has learned the Philadelphia Eagles legend would be welcomed back to WWE with open arms ... this after crushing his WrestleMania 40 appearance!!
The elder Kelce bro and his former teammate, Lane Johnson, shocked the Philadelphia crowd on Saturday ... when they sprang into action to help Rey Mysterio and his partner Andrade beat his son, Dominik Mysterio, and Santos Escobar in their tag-team match.