Director of rugby Richard Cockerill retains the same backline that started last Saturday’s win over London Wasps, but makes alterations in the front row with Ayerza and Castrogiovanni joining Rob Hawkins.
“We’ve got a couple of guys back from injury and we’ve rotated the squad over the last few weeks so we go there fresh and ready,” said Cockerill.
“We’ve been going well recently and that good form allows us to take some confidence in our game.
“It will be tough because Ulster are a good team and it is a very tough pool. It is a must-win game for both sides. At this stage of the Heineken Cup that is what it is all about.”
Leicester Tigers (v Ulster Rugby, Ravenhill, Friday 8pm)
15 Geordan Murphy (c)
14 Horacio Agulla
13 Matt Smith
12 Anthony Allen
11 Alesana Tuilagi
10 Billy Twelvetrees
9 Ben Youngs
1 Marcos Ayerza
2 Rob Hawkins
3 Martin Castrogiovanni
4 Steve Mafi
5 Geoff Parling
6 Tom Croft
7 Julian Salvi
8 Thomas Waldrom
Replacements
16 George Chuter
17 Boris Stankovich
18 Dan Cole
19 Ed Slater
20 Ben Woods
21 Sam Harrison
22 Jeremy Staunton
23 Scott Hamilton
Former Tigers fly-half Ian Humphreys in included in the Ulster side after recovering from a hamstring injury.
Ulster Rugby
15 Stefan Terblanche
14 Andrew Trimble
13 Darren Cave
12 Paddy Wallace
11 Craig Gilroy
10 Ian Humphreys
9 Ruan Pienaar
1 Tom Court
2 Rory Best
3 John Afoa
4 Johann Muller (c)
5 Dan Tuohy
6 Stephen Ferris
7 Chris Henry
8 Pedrie Wannenburg
Replacements
16 Nigel Brady
17 Callum Black
18 Adam Macklin
19 Lewis Stevenson
20 Willie Faloon
21 Paul Marshall
22 Ian Whitten
23 Adam D'Arcy
