Potter says he has his fingers crossed that James' latest knee injury is not as bad as first thought.
James was taken out of the game in the 53rd minute of the victory.
He missed England's World Cup squad because of a knee injury, but played in the game.
Potter said that they were concerned because it was the same area.
It's too early to know. Over the next few days, we will have to see. We will have to find out the extent of the thing that he felt.
He was really sad to miss the World Cup. He felt a huge blow. He brings a lot to the team. He is one of the best players in the world. When you work with him do you see how good he is?
Any team would miss him. He was supposed to play 60 minutes today but he is disappointed.
He can have a quick recovery if it's not as bad as it was.
Before the season was paused for the World Cup, James had been one of the best players in a rejuvenated Blues side who had not won in five league matches.
Potter said it was a step forward for the group.
The players deserve a lot of credit. You don't know how it's going to go with the break. The first half was pretty good. The attitude was great. It was a well-deserved victory.
We did that to evaluate and get injured players back because we weren't in the best of times. The attitude of the players has been fantastic and we used it as best we could.
The opening goal for the Blues was scored by Kai Havertz, who shrugged off a disappointing World Cup campaign with Germany.
I'm aware of the vision that he has. The German forward told Prime Video that he loved playing the balls.
The ball was perfect and I was happy to score. Hopefully, the win and goals will give us some confidence.
Graham Potter gives me the freedom to do what I want on the field. I enjoy being in the box. I get a lot of confidence from him.