Tottenham Hotspur manager Jose Mourinho is "uncomfortable" that Arsenal assistant manager Albert Stuivenberg is part of Wales' coaching team.
Boss Ryan Giggs will not be involved so Robert Page will be in charge, supported by Stuivenberg.
"National team matches should have coaches that are exclusively for them and not coaches that work for other clubs," Mourinho said.
"From what I am reading it's not Giggs that is responsible for these matches.
"I'm sorry about it because on the previous fixtures he called me and we spoke about Ben Davies, not Gareth, because Gareth was not there.