Adelaide United are on red alert for towering striker Frederic Mendy inTuesday night's AFC Champions League (ACL) clash with Jeju United - the Reds' last chance to stay alive in the competition.
Mendy, who stands at 194 centimetres, has started Jeju's past three games in the K League after coming off the bench to score against Adelaide at Coopers Stadium last month.
The Guinea-Bissau international scored Jeju's first goal in that scintillating 3-3 draw with the Reds in March and is expected to lead the line for Jo Sung-hwan's side on Tuesday night in South Korea.
Marcelo Toscano and Hwang Il-soo will float behind Mendy in Jo's 3-4-2-1 formation.
"Mendy is a very good player and very tall player," Adelaide United defender Dylan McGowan told reporters on Monday.
"Last time when he came on, a lot of balls were coming in the air and we'll have to deal with that again."
After three games in Group H, Adelaide have just one point and must win at Jeju World Cup Stadium if they are to have any chance of reaching the Round of 16.
Leadings Jiangsu Suning (9 points) host third-placed Gamba Osaka (3) in the other Group H fixture, with Jeju (4) sitting second.
Adelaide have been improving since the start of March - Friday night's 1-0 loss to Melbourne City was their first defeat in six matches - but travelling remains a concern for Guillermo Amor's side.
The Reds have won just one away match in all competitions this season.
Coach Amor, who continues to fend off questions about his future at the club, will have to do without full-back Tarek Elrich, who ruptured the anterior cruciate ligament in his left knee against City, while Iacopo La Rocca and Marcelo Carrusca aren't registered for the ACL.
Ben Garuccio switched from the right wing to left-back to cover for Elrich on Friday and is likely to do so again in the ACL, while Taylor Regan and Kim Jae-sung could step into defence and midfield respectively for Amor's unavailable imports.
Jeju have their own selection concerns - midfielder Kwon Soon-hyung, who played all but one league match last season, is out with an ankle problem and left-back Chung Woon is in doubt with a thigh strain.
Lee Chang-min is the likely replacement for Kwon after he missed the weekend's 0-0 draw with FC Seoul through suspension.
Jeju had conceded just two goals in four games in all competitions before their six-goal thriller with Adelaide but any long-term concerns about Jeju's defence appear unfounded as they have conceded just once in three K League matches since.
Australian centre-back Aleksandar Jovanovic, who came on against Adelaide last time, didn't play against Seoul and could return for this continental clash.
The Reds have had a long trip to South Korea - they departed Melbourne early on Saturday morning and had to fly via China and Seoul - but McGowan insisted they will be ready.
"We've prepared all week and all season to [play] in the Champions League and to win games and this is what we plan to do," he said.
If Adelaide fail to take three points on Jeju Island their 2016-17 season will effectively be over as the defending A-League champions have failed to qualify for the finals.