Blues head coach Phil Davies confirmed that Gareth Davies is set to start at No.10 for their European Cup clash with Toulon, but Halfpenny will be on stand-by.
The 25-year-old kicked 15 points in the victory over the Dragons and Davies has no concerns about using Halfpenny at fly-half.
"Leigh is great in attack. We put him in for some of the defensive elements in training and he was good there," Davies told Wales Online.
"There are different timings and different space to police at outside-half but we know Leigh very rarely misses tackles. He's got enough skill to play at 10 so we're lucky."
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