The Brazilian was at Old Trafford as United beat Istanbul Basaksehir 4-1.
Rafael started the game at right back for Istanbul. He was always a fan favorite during his time at United under Sir Alex Ferguson, and it appears Rafael has not lost his affection for the club in his years away.
After the game, the 30-year-old posted an image of his post-match hug with Solskjaer with the caption: "Just hope the best for you and Manchester United keep fighting my friend like you are doing.
"All the best Manchester United, thank you for the warm welcome before and after the game. Love you all."