His club career started at Wasps, and he went on to play for Bedford, Gloucester, Worcester and Harlequins.
One of them, 21-year-old Harlequins scrum-half Danny Care, said he was shocked at getting a call-up.
The Harlequins winger was suspended for a year after being found guilty of fabricating an injury.
"Harlequins acknowledge that we failed to control Dean Richards, " said Jillings in a statement.
Harlequins are to hold a press conference on 19 August when further announcements will be made.
His colourful career took him to Swansea, the Ospreys, Bristol, Harlequins, the Scarlets and Pau.
The squad will arrive in London on Tuesday ahead of Sunday's warm-up match against Harlequins.
They have also brought in Harlequins prop Louie McCarthy-Scarsbrook to add further firepower up front.
Bradford coach Steve McNamara and Harlequins' Brian McDermott have also been linked with the job.
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Second-half tries from Joe Gray and Ugo Monye also helped Harlequins to their second straight win.
Friday's last-gasp 21-20 semi-final victory at Harlequins was the Falcons' third win in a row.
Another surprise inclusion is 21-year-old Leeds full-back Ben Jones-Bishop, who is currently on loan at Harlequins.
Danny Brough added the extras and Wakefield looked to be comfortable against the threat of Harlequins.
The idea provokes an unintended response from Harlequins, a cosmopolitan club a drop-kick away from Twickenham.
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James, 20, replaces Harlequins back Hal Luscombe, who withdrew from the squad last week for family reasons.
The third young back with a chance to make a big impression is Harlequins centre Jordan Turner-Hall.
The Exiles reached the Twickenham final for the first time in their history after beating Harlequins 17-0.
As well as facing Bristol, Loffreda's side have to visit Newcastle then host Harlequins in their other fixtures.
Harlequins scrum-half Danny Care is handed a first Test start after his debut as a replacement in Auckland.
London Irish and Harlequins will meet in a rehearsal for their opening Zurich Premiership match on 4 September.
Cipriani partners Danny Care at half-back, the Harlequins number nine keeping the fit-again Harry Ellis on the bench.
The 27-year-old will also miss London Irish's next four Aviva Premiership matches, against Newcastle, Gloucester, Harlequins and Leeds.
In the 34th minute Harlequins' Mike Ross was sin-binned for persistent infringement following a series of broken scrums.
The result means Harlequins top Pool Four by six points from the French side with two games remaining.
The Exiles face Harlequins at the Stoop on Saturday, with a place in the Premiership final at stake.
Harlequins managed to string together one potent attacking move but centre David Howell spilled the ball over the line.
Hull FC lost 34-26 at Harlequins on Sunday to leave them lying next to bottom of the Super League.
Danny Ward was the only Harlequins try scorer as they showed few signs of their recent revival in form.
Leicester's Shane Jennings and Harlequins Gavin Duffy are named in the starting line-up.
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Another try would have given Bath a bonus-point win, which would have set up a last-four encounter against Harlequins.
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