St Helens boss Keiron Cunningham wary of South Sydney star Greg Inglis

St Helens coach Keiron Cunningham has warned his side they will have to stop South Sydney star Greg Inglis if they are to win Sunday's World Club Challenge.

Queensland and Australia full-back Inglis has been identified as the main threat posed by the National Rugby League champions at Langtree Park in the world club decider.

Inglis was in the Melbourne team that beat Leeds to win the 2010 World Club Challenge, and has taken over from the demoted John Sutton as captain of the Rabbitohs, owned by film star Russell Crowe. 

The Bunnies' biggest star, England's Sam Burgess left Sydney for rugby union's Bath after helping the club beat Canterbury Bulldogs in Australia's Grand Final and Cunningham is now concerned about the scoring threat of Inglis.

"He's a once-in-a-lifetime player," said the Saints boss. "It will be good to see him running around on Langtree Park. We will need to bring a complete performance or he will hurt us."

Issac Luke is dangerous out of dummy half and obviously Greg Inglis is a huge talent.

Cunningham's sentiments are echoed by his captain Jon Wilkin, who is also wary of the threat posed by New Zealand Test hooker Issac Luke.

"Our biggest challenge will be stopping them getting the momentum they are used to getting," Wilkin said. "Issac Luke is dangerous out of dummy half and obviously Greg Inglis is a huge talent.

"Every team has game-breakers and Souths have two fantastic players who would stand out in any team they play for."

Burgess will be sitting alongside Crowe among the capacity 18,000 crowd to see how his former team-mates perform against the Super League champions.

"Sam's a great player and he leaves his own legacy," said Souths' former Wigan coach Michael Maguire. "But we've got a couple of players that have come in and, although they're different types of players, they're very experienced.

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"Glenn Stewart has played in two of these World Club Challenges and Timmy Grant is a great player who has played at State of Origin level."

Stewart, who has joined Souths from Manly, will go up against St Helens' Australian stand-off Travis Burns, who was best man at the loose forward's wedding.

Luke Burgess, oldest of the four brothers, has also left the Rabbitohs since the end of last season but 22-year-old twins George and Tom remain to keep the family connection going and Maguire admits they have become integral members of the team.

"To see the twins come across and really grow the way they have is pleasing," Maguire said.

"When they first came, they were learning their trade and developing themselves, now they're two senior members of the team who turn up week in, week out and perform at their best.

"They're very passionate about how they prepare themselves and how they want to be seen and perform."

Watch St Helens v South Sydney from 6.45pm on Sky Sports 1 on Sunday