Wales centre Jonathan Davies claimed that France's substitution didn't feel right after their loss.
France scored a converted try in the 100th minute of the game to defeat Wales 20-18 in their Six Nations clash in Paris on Saturday.
France prop Uini Atonio went off after complaining about a head injury which meant previously substituted Rabah Slimani could come back onto the field which would have aided France after a long slog of scrums.
Davies felt that it the call didn't seem right.
"It was a very long extra time, if you call it that," Davies told reporters after the game.
"It's a tough pill to swallow. It was disappointing how it ended.
"Of course, if the prop is complaining about a head injury, player welfare is important. It just didn't seem right, in my opinion."
Wales coach Rob Howley was adamant that, that situation shouldn't be allowed in rugby.
"What happened in the last 10 minutes of that game shouldn't ever happen again on an international rugby field," Howley said.
"The process leading up to the change of the French tighthead, the way that occurred, we love our game too much to have those decisions. It is hugely disappointing.
"The process that occurred prior to him warming up before going back on, one of their (France's) coaches went outside the technical area, had a word with their doctor and within a minute of that, he went on and took their tighthead off.
"The evidence suggests that it's not in the integrity of our game. The referee (Wayne Barnes) is told an HIA needs to take place, and he trusts that information. It wasn't his fault in the last 10 minutes. He has listened to a medic."