MIKAEL Lustig has admitted he performed “like a Fourth Division player” in the first half of Celtic’s pre-season friendly with Rapid Vienna in Austria on Saturday.

However, the right back is confident that both he and his team mates will be in peak condition by the time they come to play their Champions League qualifier against either La Fiorita of San Marino or Linfield of Northern Ireland next week.

The Scottish champions were disappointing in the opening 45 minutes of their game in Amstetten and fell behind just before half-time when Brazilian striker Joelinton won and then converted a penalty.

Read more: "I knew Celtic target Charly Musonda was a special talent - when he ran rings around me at training aged just 12"The Herald: 30/06/17 . AUSTRIA . (L-R) Celtic's Mikael Lustig, Stuart Armstrong, trialist Anton Rodgers and Scott Sinclair.

Brendan Rodgers changed all 11 of his players after an hour had been played at the Ertl Glas Stadium and his charges finished the run-out strongly.

Moussa Dembele, playing for Celtic for the first time since suffering a hamstring strain in the Scottish Cup semi-final win over Rangers back in April, levelled from the spot in the 73rd minute and the game finished 1-1.

“It was a tough day,” said Lustig. “It was really warm out there, but there was some sloppy play. It was good for our fitness with a lot of running, but unfortunately a lot of it was in the wrong direction.

“We gave away a lot of possession. We wanted to play better and pick our passes, but it was quite sticky. Still, it was really good in terms of our fitness.

“You lose a lot when you are away for a month. You go from playing well, then have three weeks out and you come back like a Fourth Division player. It takes three weeks to get back. Some of us have been in for a few weeks now, others just one week, so it’s going to take time.”

He added: “It was only a pre-season game, but the second half was a lot better. The boys who played in the last 30 minutes did very well. The manager spoke to us at the end. It was a good session and he wanted to tell the players that.

Read more: "I knew Celtic target Charly Musonda was a special talent - when he ran rings around me at training aged just 12"

“We know it’s a very important few weeks for us and we need to be switched on straight away. We didn’t play our best football at this time last year. So we know we are probably going to be more confident a year on. It’s about getting fitter and being ready.”

Lustig was pleased to see Dembele, who has featured for the France Under-21 side this summer, back in action for Celtic and was delighted that the 20-year-old, who netted 32 goals in 48 games last season, marked his return with a goal.

The Swedish internationalist is hopeful the Scottish champions can hold on to the striker, who has been repeatedly linked with moves to the Premier League in England, for the duration of the 2017/18 campaign.

“It was good to have Moussa,” he said. “Hopefully he’ll get fitter and fitter. We want to keep all of the players, keep the squad intact and maybe add some players as well. But it’s football. If the right money comes in then we know the club have to think about it.

“The manager has said no one is leaving while we have the Champions League qualifiers. We know how important Europe is.”