The Spaniard impressed for Leeds United at Highbury last night.
The 31-year-old made his debut for Leeds in Wednesday's penalty shootout win at Fleetwood Town as United made it through to the second round of the League Cup.
The Spaniard, who joined the Whites on a six-month loan with a view to a permanent deal from Al-Arabi, graduated from Valencia's academy and is arguably the most high-profile of Garry Monk's seven signings so far this summer.
And former Leeds boss Redfearn is enthused by how the former Swansea City man - who also scored his penalty during the shootout - performed on his bow.
"Everything he touched was class [about Hernandez]. His touch, his awareness about him. He links play," Redfearn told TV Yorkshire. "There were one or two really good performances."
Monk looked on course for his second straight defeat as Leeds boss, but Marcus Antonsson, in his second game for the club, struck on 89 minutes to cancel out Aaron Amadi Holloway's first-half opener and force extra-time.
There, Antonsson continued to threaten and the Swede won a penalty early in the additional half-hour which Chris Wood duly converted.
Ashley Hunter levelled up with nine minutes to go, but Uwe Rosler would be denied a win against the club which sacked him in October.