Toulon have added full-back Leigh Halfpenny as an additional player to their squad ahead of next month's Champions Cup quarter-final against Racing 92.
Halfpenny, who has been sidelined since before the 2015 Rugby World Cup with a knee injury, is joined by Théo Belan and Iuri Natriashvili as Toulon's new arrivals.
Other notable reinforcements for teams in the last eight of Europe's top tier club competition are Mitch Lees and Lachie Turner for Exeter, Jean de Villiers (Leicester), Craig Burden and Aled de Malmanche (Stade Français) and Wasps international backs, Andrea Masi and Siale Piutau.
Exeter: Harry Williams (prop), Mitchell Lees (second-row), Lachlan Turner (wing)
Leicester: Riccardo Brugnara (prop), Jean de Villiers (centre), Michael Van Vuuren (hooker)
Northampton: Campese Ma'afu (prop), James Wilson (full-back), Sion Bennett (back-row)
Toulon: Iuri Natriashvili (hooker), Leigh Halfpenny (full-back), Theo Belan (centre)
Racing 92: Khatchik Vatanov (prop), Yoan Audrin (wing), Mathieu Voisin (flanker)
Saracens: David Porecki (hooker), Akinbiyi Alo (prop), Hayden Thompson-Stringer (flanker)
Stade Français: Aled de Malmanche (hooker), Craig Burden (hooker), Remi Bonfils (hooker)
Wasps: Andrea Masi (centre), Siale Piutau (centre)
Connacht: JP Cooney (prop), Jake Heenan (flanker), Conor McKeon (fly-half)
Gloucester: James Gibbons (prop), Luke Cole (hooker), Ollie Thorley (centre)
Grenoble: Aurelien Azar (prop), Paulin Mas (hooker), James Hart (scrum-half)
Harlequins: Charlie Piper (hooker), Henry Cheeseman (wing), Stanley South (second-row)
London Irish: Richard Palframan (prop), Ciaran Hearn (centre/wing), Will Lloyd (second-row)
Montpellier: Yvan Watremez (prop), Pierre Spies (number eight), Francois Steyn (centre)
Dragons: Leon Brown (prop), Owen Davies (scrum-half), Harrison Keddie (back-row)
Sale Sharks: Sam Tuitupou (centre), Connor Dever (scrum-half)