Second-rower Parling ended last season with a Premiership winner’s medal in his first term with the club, but he suffered a neck injury on tour with England in the summer.
He is named among the Tigers replacements for Friday’s Aviva Premiership clash with Harlequins, winners at Welford Road two weeks ago in the LV= Cup.
Geordan Murphy, Anthony Allen and George Chuter have returned from international training this week to take a place in the starting line-up and Manu Tuilagi makes his first start in the Aviva Premiership, taking the place of brother Alesana, who is away with Samoa.
Props Fraser Balmain and Ryan Bower are among the replacements after playing in the cup match against the Ospreys last Friday, but England international centre Dan Hipkiss is ruled out with a hamstring injury.
“It’s good news for everyone to have Geoff Parling back in the squad,” said Tigers director of rugby Richard Cockerill.
“He had a strong season with us last season and he has come through his rehab from injury pretty well.
“This is a big period of the season for us with Quins on Friday followed by another home game against Newcastle next Saturday. We need to pick up points to keep up with the top four in the table and push on from there.”
Tickets for Friday’s game are available now from the Tigers ticket office. Phone the hotline on 0844 856 1880, call in at the ticket office at Welford Road (open 8.30am-5pm Thursday and from 8.3am Friday) or book online.
Leicester Tigers (v Harlequins, Welford Road, Friday 7.45pm)
15 Geordan Murphy (c)
14 Scott Hamilton
13 Matt Smith
12 Anthony Allen
11 Manu Tuilagi
10 Billy Twelvetrees
9 James Grindal
1 Peter Bucknall
2 George Chuter
3 Julian White
4 Ed Slater
5 George Skivington
6 Thomas Waldrom
7 Craig Newby
8 Jordan Crane
Replacements
16 Rob Hawkins
17 Fraser Balmain
18 Ryan Bower
19 Steve Mafi
20 Geoff Parling
21 Jason Spice
22 George Ford
23 Lee Robinson
Harlequins team: 15 Mike Brown, 14 George Lowe, 13 Ollie Smith, 12 Jordan Turner-Hall, 11 Tom Williams, 10 Nick Evans, 9 Karl Dickson; 1 Ceri Jones, 2 Joe Gray, 3 James Johnston, 4 Tomas Vallejos, 5 George Robson, 6 Chris Robshaw (c), 7 Will Skinner, 8 Tom Guest. Reps: 16 Chris Brooker, 17 Mark Lambert, 18 John Andress, 19 Ollie Kohn, 20 Maurie Fa'asavalu, 21 Dave Moore, 22 Benjamin Urdapilleta, 23 Ross Chisholm
