The four - time Cup champion kept the door open to running more if Earnhardt does n't return from concussion - like symptoms .
The four - time Cup champion is coming out of retirement to fill in for the injured Dale Earnhardt Jr. the next two races .
The four - time Cup champion , who is coming out of retirement to fill in for the injured Dale Earnhardt Jr. the next two races , kept the door open to running more if Earnhardt does n't return from concussion - like symptoms .