Blockbusting Chiefs centre Robbie Fruean faces more heart treatment and will miss the Super Rugby champions’ trip to Australia and South Africa.
Fruean came off the reserve bench in his team’s 36-20 win over the Stormers in Hamilton on Friday but lasted only 21 minutes before being replaced due to shortness of breath.
He was diagnosed with an irregular heartbeat and will undergo a surgical procedure known as ablation to correct the problem, keeping him off the field for four-eight weeks.
It rules him out of Saturday’s game against the Western Force in Perth followed by further tour clashes with the Bulls and Cheetahs in South Africa.
Fruean, 25, underwent open heart surgery seven years ago before returning to rugby two years later.
He struggled to play the full 80 minutes in four seasons at the Crusaders and, following a second heart operation to replace a faulty valve, joined the Chiefs this year.
He began the season promisingly with a brilliant long-range try against the Crusaders but missed their win over the Highlanders because of concussion.
His latest ailment is a blow to the second-placed Chiefs, who are three wins-from-three to begin their pursuit of a third successive title.
Prop Ben Afeaki, flanker Sam Cane and halfback Augustine Pulu are included in the 27-man tour squad after overcoming ailments.
Lock Ross Filipo and backs Robbie Robinson and Bundee Aki are still out, nursing longer-term injuries.
Chiefs tour squad: Backs: Mils Muliaina, Gareth Anscombe, Tim Nanai-Williams, Asaeli Tikoirotuma, Tom Marshall, Jordan Payne, Andrew Horrell, Anton Lienert-Brown, Aaron Cruden, Tawera Kerr-Barlow, Augustine Pulu, Brad Webber
Forwards: Kane Thompson, Liam Squire, Sam Cane, Tanerau Latimer, Liam Messam, Brodie Retallick, Michael Fitzgerald, Matt Symons, Ben Afeaki, Ben Tameifuna, Josh Hohneck, Jamie Mackintosh, Pauliasi Manu, Mahonri Schwalger, Rhys Marshall.