Steven Mouyokolo played 90 minutes of Celtic's 1-0 friendly defeat against Ukrainian side Sevastopol as the French defender attempts to win a contract at Parkhead.
The former Hull and Wolves defender, who was released from an injury-hit spell at Molineux in January, put in a solid display alongside new signing Virgil van Dijk and then Kelvin Wilson in central defence in the German town of Fuerstenfeldbruk.
Celtic went down to a soft free-kick from Kostiantyn Iaroshenko midway through the second half which left Fraser Forster angry with himself for his failure to keep it out.
The Englishman had made several good stops previously, but the curling effort from 25 yards went to the side of the goal he was guarding and appeared to go through his hands.
Portuguese striker Amido Balde also played and forced a good second-half save from the goalkeeper of the Ukrainian second-tier champions after some strong play in the box, but failed to make the most of a couple of first-half opportunities.
Wilson volleyed wide a late chance to equalise as the referee inexplicably played almost 10 minutes of injury-time.
Celtic manager Neil Lennon also handed run-outs to youngsters such as right-back Darnell Fisher and midfielders Liam Henderson and Calum Waters.
Lennon was impressed with the trialist's performance, and those of his other players.
"I'm really pleased with their attitude," said Lennon, quoted on Celtic's official Twitter account.
"Steven Mouyokolo hadn't played 90 minutes for a year and handled himself well.
"They're a wee bit ahead of what I expected, because the close season was so short, and that pleased me.
"It was a really good workout and maybe on another day we would have won."
Lennon also revealed that Cardiff and Southampton target Victor Wanyama would join up with the squad tomorrow.
Meanwhile, former Hearts right-back Fraser Mullen enjoyed an excellent start to his Hibernian career as he scored a well-executed free-kick in a 3-1 away win over a Gibraltar XI.
Young forwards Danny Handling and Ross Caldwell were also on target while out-of-contract midfielder Kevin Thomson started for Pat Fenlon's side.
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