The 22-year-old wide receiver announced the diagnosis on Sunday but said he was in “good spirits” and hoped for a recovery.
“I am currently receiving excellent medical care, I am in a good mood and look forward to recovering at a later time.
“Because of this diagnosis, I will most likely not play football this season. My focus will be on my health and wellness.
“Thank you in advance for your support and good wishes. I can’t wait to come back stronger than ever. God bless.”
“John overcame all difficulties”
Metchi was selected 44th overall in the NFL Draft that year.
The Alabama player had 96 catches for 1,142 yards and eight touchdowns last season before dropping out after tearing his anterior cruciate ligament in December.
His former Alabama coach Nick Saban sends his best regards.
“It is a blessing that he is in a city known for caring and organizing, the Houston Texans who will be with him throughout this journey.
“Our thoughts and prayers will remain with him throughout this battle.”
