Summer signings Peter Betham, Greg Bateman, Mike Fitzgerald and Lachlan McCaffrey will make their first Leicester Tigers appearance in Saturday's match against Los Pumas at Welford Road.All four are included in a 30-man squad for the Marcos Ayerza Testimonial Challenge fixture, with forwards Bateman and Fitzgerald in the starting XV alongside wing Betham, and McCaffrey among the replacements.   Pumas international wing Gonzalo Camacho will also line up for the first time in a Tigers shirt after his recovery from a shoulder injury.   While Tigers open their pre-season programme on home turf, the fixture provides the visitors from Argentina with their last warm-up game before the Rugby World Cup.   Tigers also include internationals Seremaia Bai, Freddie Burns, Christian Loamanu and Mathew Tait. First-team regulars Sam Harrison, Sebastian de Chaves, Fraser Balmain, Graham Kitchener, Matt Smith and Adam Thompstone will also have a first run of the season.   England Under-20s quartet caps Will Owen, Charlie Beckett, Oli Bryant and Owen Hills are likely to gain some big-game experience, with academy prospects Paolo Odogwu, Ben White and George Worth also included in the squad on an historic afternoon.   The Pumas bring their World Cup squad, including prop Ayerza and former Tigers trio Horacio Agulla, Lucas Amorosino and Pablo Matera.   Kick-off at Welford Road is at 3pm.   Tickets for Saturday’s game are available now, priced £25 adult seating, £10 junior or £60 family (2 adults, 2 juniors), or £22/£8/£52 terrace.   Purchase in person at the Tigers Club Store at Welford Road (9am-5pm weekdays and from 9am Saturday), phone 0116 319 8888 (option 2) (8.30am-5pm weekdays and from 9am Saturday) or book online at the Tigers ticket office by clicking here.   Season ticket holders who have purchased places will either have the game loaded on to their access card or have been sent match tickets. If in doubt, please contact the ticket office.   Leicester Tigers 15 Mathew Tait (c) 14 Peter Betham 13 Christian Loamanu 12 George Catchpole 11 Gonzalo Camacho 10 Tommy Bell 9 Sam Harrison 1 Riccardo Brugnara 2 Greg Bateman 3 Tiziano Pasquali 4 Joe Maksymiw 5 Sebastian de Chaves 6 Mike Fitzgerald 7 Will Owen 8 Laurence Pearce   Replacements: Fraser Balmain, Charlie Beckett, Will Evans, Jake Farnworth, Owen Hills, Graham Kitchener, Lachlan McCaffrey, Ed Milne, Matt Parr, Oliver Povoas, Harry Thacker, Harry Wells, Seremaia Bai, Oli Bryant, Freddie Burns, Paolo Odogwu, Matt Smith, Adam Thompstone, George Tresidder, Ben White, George Worth   Los Pumas 15 Joaquín Tuculet 14 Santiago Cordero 13 Marcelo Bosch 12 Juan Martín Hernández 11 Juan Imhoff 10 Nicolás Sánchez 9 Tomás Cubelli (c) 1 Marcos Ayerza 2 Julián Montoya 3 Nahuel Tetaz Chaparro 4 Guido Petti Pagadizabal 5 Tomás Lavanini 6 Javier Ortega Desio 7 Juan Martín Fernández Lobbe 8 Facundo Isa   Replacements: 16 Lucas Noguera, 17 Juan Pablo Orlandi, 18 Matías Alemanno, 19 Mariano Galarza, 20 Juan Manuel Leguizamón, 21 Martín Landajo, 22 Santiago González Iglesias, 23 Lucas González Amorosino, 24 Leonardo Senatore, 25 Pablo Matera, 26 Jerónimo de la Fuente, 27 Matías Moroni, 28 Juan Pablo Socino, 29 Horacio Agulla