Abdi has missed the Hornets' last two matches with a foot injury and looks likely to sit out once more at Oakwell.
Iriney overcame a leg injury to make the bench for Tuesday's late 2-1 victory over Doncaster and will hope for a recall after boss Gianfranco Zola made a total of six changes for the clash.
Long-term absentees Nyron Nosworthy (Achilles) and Tommie Hoban (ankle) remain sidelined as Watford aim to build on their first win in five league matches.
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