The Revolution defender took an indefinite leave of absence after being diagnosed with leukemia.
Henry, after doing his usual post-training media availability, added a few words about the stricken 24-year-old.
"Another thing I wanted to say, which is very important to me, because sometimes people talk about the game, but I just wanted to say something about what happened to Kevin Alston," the Frenchman began.
"I just wanted to say to his family, and to him, all the very best. In this type of moment, you know, you can feel alone. I don't know him, but all the very best to him and his family."
This isn't the first occasion Henry has reached out to an ailing fellow professional. Last year, the striker took a 5,000 mile round-trip to visit former teammate Fabrice Muamba after the then-Bolton Wanderers midfielder collapsed on the pitch during a match against Tottenham Hotspur.