Harsley is reportedly vying with the former Middlesbrough and current Wycombe Wanderers bosses for the Barnsley vacancy.
Diogo Jota joined Wolverhampton Wanderers on a season-long loan deal from Atletico Madrid in the summer transfer window.
The Wycombe Wanderers manager played under Holloway at Queens Park Rangers.
Leeds United will travel to face Wycombe Wanderers over the international break.
Harry Redknapp has resigned as QPR manager - but who do the bookmakers believe will replace him in the Loftus Road hot seat?
Taking a look at the exploits of QPR youngster Bruno Andrade...