The Tottenham winger has played just 45 minutes of his club's pre-season programme against the backdrop of Real Madrid's world-record bid for his signature.
Bale was allowed to join up with the Wales squad ahead of Wednesday's friendly against the Irish despite the foot injury which kept him out of a weekend game against Espanyol.
But Andre Villas-Boas said at the weekend he did not expect Bale to be fit for Spurs' Premier League opener, and Wales' assistant manager Kit Symons told Sky Sports News there is no chance of the player appearing at the Cardiff City Stadium.
He said: "Gareth will do a light session. He's not done the sufficient work yet to feature (on Wednesday) but the great thing is he wanted to be part of the group and we're pleased to have him on board.
"It shows the levels of trust that we've built up with all the top clubs, the way we conduct ourselves within the organisation."
Among the supporters in attendance to welcome Wales at their new training facility at Dragon Park were Spanish journalists keen to find out the latest on Bale's future.
Symons said: "I don't think it will be a distraction. They only want to talk to Gareth and we know Gareth won't be featuring on Wednesday night, so I don't think it will affect the group at all."
Joining Bale on the sidelines this week are Aaron Ramsey and James Collins, who have both withdrawn from the squad with minor injuries.
Swansea full-back Jazz Richards and Brighton midfielder Andrew Crofts have been called up as replacements.
Symons said: "It's unfortunate for the boys who miss out, but it gives an opportunity to other people, and we've got some good boys coming through."