Matt Dawson has told the British & Irish Lions to be prepared to go to a "new place" mentally if they are to seal a series win over South Africa with victory in the second Test at Cape Town on Saturday.
The Lions lead the three-match contest 1-0 following last week's 22-17 success over the Springboks.
That means they are now just 80 minutes away from emulating the 1997 Lions, for whom former England scrumhalf Dawson starred, in winning a series against a South Africa side who, then as now, are the reigning world champions.
Dawson, however, warned the Springboks would be smarting from a narrow loss that led to an extraordinarily prolonged and detailed critique of the performance of Australian referee Nic Berry by Rassie Erasmus, SA Rugby's director of rugby.
"My advice to the Lions would be, you are going to play against a possessed side like you've never come across before," said Dawson.
"You're going to have to take yourself physically and mentally to a new place, you're going to have to challenge yourself," added Dawson, who featured throughout a 1997 series where the Lions went 2-0 up before losing the third Test.
"That's the tough part, that's going to separate you from the opposition. Can you mentally take yourself to a place where you have crystal-clear thinking in the cauldron and pressure cooker of elite Test match rugby?... it's going to be the head that wins it at the weekend."
Dawson added a team led by veteran Wales lock Alun Wyn Jones, the most capped rugby union international of all time, had enough experience not to get swept up by talk of joining the 1974 or 1997 Lions as series-winners in South Africa.
"A first series win in South Africa in 24 years would be huge, these opportunities just don't come along very often," the 2003 World Cup-winner said in a blog released by William Hill.
15 Willie Le Roux, 14 Cheslin Kolbe, 13 Lukhanyo Am, 12 Damian de Allende, 11 Makazole Mapimpi, 10 Handre Pollard, 9 Faf de Klerk, 8 Jasper Wiese, 7 Pieter-Steph du Toit, 6 Siya Kolisi (captain), 5 Franco Mostert, 4 Eben Etzebeth, 3 Frans Malherbe, 2 Bongi Mbonambi, 1 Steven Kitshoff
Substitutes: 16 Malcolm Marx, 17 Trevor Nyakane, 18 Vincent Koch, 19 Lood de Jager, 20 Marco van Staden, 21 Kwagga Smith, 22 Herschel Jantjies, 23 Damian Willemse
British & Irish Lions
15 Stuart Hogg (Scotland), 14 Anthony Watson (England), 13 Chris Harris (Scotland), 12 Robbie Henshaw (Ireland), 11 Duhan van der Merwe (Scotland), 10 Dan Biggar (Wales), 9 Conor Murray (Ireland) 8 Jack Conan (Ireland), 7 Tom Curry (England), 6 Courtney Lawes (England), 5 Alun Wyn Jones (captain, Wales), 4 Maro Itoje (England), 3 Tadhg Furlong (Ireland), 2 Luke Cowan-Dickie (England), 1 Mako Vunipola (England)
Substitutes: 16 Ken Owens (Wales), 17 Rory Sutherland (Scotland) 18 Kyle Sinckler (England), 19 Tadhg Beirne (Ireland), 20 Taulupe Faletau (Wales), 21 Ali Price (Scotland), 22 Owen Farrell (England), 23 Elliot Daly (England)