"I think it's wonderful for those two cities that they are now in the Premier League," he told Sky Sports News.
"Both Cardiff and Swansea have been long time members of the football league, they've been long time members of the FA and it's a unique situation.
"Changes were made throughout FIFA to ensure that teams played in the countries where they were situated, this is an entirely different situation because permission was given that if someone was in that league prior to all these arrangements being put into place, they could continue.
"So I think it's fairly good for Welsh football that both Cardiff and Swansea are now in the Premier League."
Of the proposition of Scotland's two biggest clubs doing the same, Boyce added: "There's all these talks about Rangers entering England but quite honestly I do not see that happening, purely because FIFA are adamant now that clubs should play in the countries where they are situated.
"This is a completely one-off situation."