Wales finished bottom of the Six Nations for the first time in 21 years and lost the series 2-0.
They narrowly beat Queensland Reds, but A defeat to Fiji in November would be a record-equalling 10th successive international loss.
But Collier-Keywood insists Gatland is the right man for the job.
“We've asked Warren to have a specific objective heading towards the next World Cup,” Collier-Keywood said.
“Our pathways were not in the position they should've been in, so he's taken this opportunity over this Six Nations and summer series to try out some new players.
“If you look at the performances, you can see that some of the players have tried out really well, we're starting to get strength in depth and some of these players are on their way of becoming regular internationals.
“It is part of a plan, we've asked him to do it and he's getting on with it, of course we're going to support him.”
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