The 19-year-old Leeds midfielder didn't feature during his side's 1-0 defeat on Saturday afternoon.
The 49-year-old selected both Billy Sharp and Steve Morison in a 4-4-2 formation for Leeds, with the Yorkshire side ultimately losing 1-0 at home to the Bees.
Explaining his decision to leave 19-year-old playmaker Mowatt out, however, Redfearn insisted his thinking was purely tactical and nothing to do with Mowatt's form.
"Just that we're at home, that we had to make the running. Billy looked sharp when he came on against Huddersfield and took his goal well," the Leeds boss said when asked what his decision was based on.
"He's in a vein of form. We needed a big target man up there with him, so it's just something that we looked at."
Naturally, Redfearn will want to shield his players from criticism but it is perhaps no coincidence Mowatt was the fall guy in midfield after a lacklustre run of form at Elland Road.
The 19-year-old has starred so far this campaign, at one point being nominated for the Championship Player of the Month award.
For one so young, however, it is easy to suffer dips in both confidence and form - and that certainly appears to be the case for the Leeds midfielder at present.
Mowatt and co currently sit 20th in the Championship table after their Brentford defeat and travel to Reading on Tuesday night.