Last season's Aviva Premiership champions, Leicester Tigers, have offset the departures of the likes of Martin Castrogiovanni to Toulon and of George Ford to Bath Rugby, as well as the retirement of Geordan Murphy, by adding Ryan Lamb (Northampton Saints), Gonzalo Camacho (Exeter Chiefs) and the Perpignan pair, David Mélé and Jerome Schuster to their ranks.
Not surprisingly, the main activity to date has taken place in France with Racing Metro 92 swelling their roster with star players such as Jamie Roberts (Cardiff Blues), Jonny Sexton (Leinster Rugby), Dan Lydiate (Newport Gwent Dragons), Soane Tonga'huia and Brian Mujati (both Northampton Saints), and the reigning Top 14 champions, Castres Olympique, have signed Richie Gray from Sale Sharks.
The 2013 Heineken Cup champions, Toulon, have boosted an already powerful squad by signing Bryan Habana (Stormers), Drew Mitchell (Waratahs), Michael Claassens (Bath Rugby) and Castrogiovanni, while Montpellier will surely challenge once again for the tournament knockout stage with the likes of Jim Hamilton (Gloucester Rugby), René Ranger (Auckland Blues), Wynand Olivier (Blue Bulls) and Nicolas Mas (Perpignan) on board.
The return of Gethin Jenkins after a season in Toulon, along with Matthew Rees's move from the Scarlets, comes as major boost to the Cardiff Blues, while John Barclay's switch from Glasgow Warriors to the Scarlets will strengthen the club's back row options.
In Ireland, Leinster Rugby have hogged the headlines by signing Zane Kirchner and Mike McCarthy from the Blue Bulls and Connacht Rugby respectively while in Scotland, Richie Vernon has signed for Glasgow Warriors from Sale Sharks and Jack Cuthbert has moved from Bath Rugby to Edinburgh Rugby.