The Arsenal youngster made his first league start against Leeds on Tuesday, four days after going to hospital with a mystery groin injury.
"It wasn't a major thing," said 19-year-old Afobe. "I had a problem with my groin and we thought it was best to get to hospital to make sure it wasn't anything serious.
"Unfortunately, I ended up missing the game against Crystal Palace (last Saturday) but obviously my health was more important.
"It feels fine now, so hopefully it won't happen again."