Shapovalov, 17, handed Britain the Davis Cup tie when he was disqualified against Kyle Edmund on Sunday for bashing the ball in frustration and inadvertently catching Gabas in the eye.
Gabas was taken to hospital in Ottawa as a precaution after being left with bruising and swelling around his left eye.
No serious damage was found, but Gabas insisted the incident could have been a lot worse.
"I came off the court looking like Rocky Balboa," Gabas was quoted as saying by Sky Sports.
"I feel quite lucky it wasn't worse. Players can be a bit crazy these days.
"I could see he was angry and that something was coming but I never thought he would hit me."
The International Tennis Federation fined Shapovalov $7,000 (6,500 euros), rather than the maximum $10,000, after accepting he had not intentionally struck Gabas after smacking a ball off the court in anger at losing a point.
Gabas said Israel-born Shapovalov, the junior Wimbledon champion, apologised for his actions.
"At the moment I'm OK, I'm on painkillers but I have an appointment to see a specialist when I get home.
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