Coutinho scored as Liverpool came from behind to beat Stoke 2-1 in the Premier League on Saturday and keep their top-four chances intact.
However, the Brazil international almost did not feature at bet365 Stadium before playing through the pain barrier.
"I joined up in the morning [of the game]. They asked me to stay at home because I was not feeling well but I wanted to be here," said Coutinho.
"I wanted to be involved with the team. The manager decided because I was not 100 per cent.
"I want to keep going to keep scoring and helping my team and keep learning from my manager. This was a big win. There are a lot of points to fight for and every game for us is important."