The decisive goal came on 68 minutes, with Ledley taking advantage of some sloppy defending to saunter into the danger zone and heading in a free kick from Ki.

BBC: Sport - Football - Inverness CT 1-2 Celtic

Ledley's winner followed a free-kick by Ki Sung-Yueng, but Butcher felt Stuart Duff had been harshly penalised for a challenge on Emilio Izaguirre.

BBC: Joe Ledley heads Celtic's winner

And the Welsh international sealed the victory with a simple header from a Ki Sung-Yeung free kick midway through the second half.

BBC: Sport - Football - Inverness CT 1-2 Celtic

Ki Sung-yueng's free-kick from close to the right corner flag was inadvertently flicked on by Kostantinos Katsouranis at the near post into the path of onrushing centre-back Lee Jung-soo, who smartly adjusted his body position before volleying in from close range with goalkeeper Alexandros Tzoras nowhere in sight.

BBC: South Korea 2-0 Greece

Grainger was sent in for an early bath for a second bookable offence following a tackle on Stokes, then Smith was at full-stretch as Ki curved in a long-range free-kick that inched wide.

BBC: Emilio Izaguirre

With just over one minute on the clock, Celtic opened the scoring when Ki Sung-Yong delivered a low free kick back into the St Johnstone penalty area from wide on the right and Stokes fired in from 18 yards.

BBC: Emilio Izaguirre

Georgios Samaras was selected as the lone striker and the Greek won an early free-kick that was blazed well over the top by Ki.

BBC: Alan slots home a first-half penalty for Braga