It is not believed that Defour has a serious knee problem, but he does not want to get to the bottom of his niggling injuries in that area.
His manager spoke about the issues at a recent press conference.
"He's done very well," said Dyche.
"It's something he's had in his knee for a couple of weeks.
"It's been a bit of a problem and he felt, and we felt, it was right to get it looked at.
"We will make a decision when we know more. We'll find out more in the next few days."