Sheffield United were relegated through goal difference after their 2-1 defeat by Wigan at Bramall Lane.
Finland international left-back Kallio, 31, has already had one loan spell at Bramall Lane this season.
The Yorkshire side will run out onto the Bramall Lane pitch with the slogan "Homophobia: Tackle It!"
The 39-year-old has a year left on his contract at Bramall Lane but is keen to get into management.
Yorkshireman Warnock, who has been in charge at Bramall Lane since 1999, said he remains in a similar position to Hart.
BBC: SPORT | Football | My Club | Leeds United | Warnock and Hart wait on Leeds
Gillespie, 33, who has been out of favour at Bramall Lane this season, last month spoke of a "fall-out" with manager Kevin Blackwell.
Michael Kightly, Sylvan Ebanks-Blake and Richard Stearman are part of the England Under-21 squad to take on the Czech Republic at Bramall Lane.
Wigan attacked to gain a half-time lead and survived a bombardment to retain it after the break in a frantic Bramall Lane atmosphere.
Marvin Emnes scored a late winner as Middlesbrough sent Sheffield United to the bottom of the Championship table with a 2-1 victory at Bramall Lane.
The 39-year-old has a year left on his Bramall Lane contract but is keen to get into management and recently passed his Uefa pro licence qualification.
The Eagles will also make history on Sunday at Bramall Lane by becoming the first professional sports club to display an anti homophobia message on their shirts.
It may not have been pretty at Bramall Lane, but Jewell will not care as Wigan arrested a desperate slide in form to send the Blades down.
Finigan is ruled out of Sunday's game at Bramall Lane after picking up an injury from parent club Bradford and Crookes will undergo a fitness test on Friday night.
Sheffield United fans will remember defender Traianos Dellas, who has 50 caps for Greece, from his two-year spell at Bramall Lane, while captain Nikos Nikolaou has 27 caps for Cyprus.
City had dominated but failed to create clear-cut chances, though Richards' eventual breakthrough ensured there will be a Manchester derby in the FA Cup semi-finals for the first time since 1926, when City beat United at Bramall Lane in Sheffield.
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