Here, we look at how deep Warren Gatland's options run with four top-class starting XV’s if everyone is fit and available.
FULLBACK
First choice: Stuart Hogg (Scotland)
Second choice: Liam Williams (Wales)
Third choice: Elliot Daly (England)
Fourth choice: Leigh Halfpenny (Wales)
WING
First choice: Jonny May (England)
Second choice: Jacob Stockdale (Ireland)
Third choice: George North (Wales)
Fourth choice: Jack Nowell (England)
OUTSIDE-CENTRE
First choice: Jonathan Davies (Wales)
Second choice: Henry Slade (England)
Third choice: Garry Ringrose (Ireland)
Fourth choice: Rory Hutchinson (Scotland)
INSIDE-CENTRE
First choice: Manu Tuilagi (England)
Second choice: Robbie Henshaw (Ireland)
Third choice: Sam Johnson (Scotland)
Fourth choice: Nick Tompkins (Wales)
WING
First choice: Josh Adams (Wales)
Second choice: Joe Cokanasiga (England)
Third choice: Blair Kinghorn (Scotland)
Fourth choice: Keith Earls (Ireland)
FLY-HALF
First choice: Owen Farrell (England)
Second choice: Finn Russell (Scotland)
Third choice: Johnny Sexton (Ireland)
Fourth choice: Dan Biggar (Wales)
SCRUM-HALF
First choice: Gareth Davies (Wales)
Second choice: Conor Murray (Ireland)
Third choice: Rhys Webb (Wales)
Fourth choice: Ali Price (Scotland)
LOOSEHEAD-PROP
First choice: Mako Vunipola (England)
Second choice: Rory Sutherland (Scotland)
Third choice: Cian Healy (Ireland)
Fourth choice: Ellis Genge (England)
HOOKER
First choice: Jamie George (England)
Second choice: Ken Owens (Wales)
Third choice: Stuart McInally (Scotland)
Fourth choice: Luke Cowan-Dickie (England)
TIGHTHEAD-PROP
First choice: Tadhg Furlong (Ireland)
Second choice: Kyle Sinckler (England)
Third choice: Zander Fagerson (Scotland)
Fourth choice: Andrew Porter (Ireland)
LOCKS
First choice: Maro Itoje (England) & James Ryan (Ireland)
Second choice: Alun Wyn Jones (Wales) & Jonny Gray (Scotland)
Third choice: Courtney Lawes (England) & Iain Henderson (Ireland)
Fourth choice: Joe Launchbury (England) & Richie Gray (Scotland)
BLINDSIDE-FLANKER
First choice: Tom Curry (England)
Second choice: Jamie Ritchie (Scotland)
Third choice: Peter O'Mahony (Ireland)
Fourth choice: Aaron Wainwright (Wales)
OPENSIDE-FLANKER
First choice: Sam Underhill (England)
Second choice: Justin Tipuric (Wales)
Third choice: Ellis Jenkins (Wales)
Fourth choice: Hamish Watson (Scotland)
NUMBER 8
First choice: Billy Vunipola (England)
Second choice: Taulupe Faletau (Wales)
Third choice: CJ Stander (Ireland)
Fourth choice: Ross Moriarty (Wales)
PICK YOUR LIONS XV: