Munich: Bayern Munich are looking to regroup in the Champions League at home to Celtic on Wednesday as Jupp Heynckes coaches his first European game since winning the 2013 final.

The 72-year-old steered Bayern to the Champions League title four years ago by beating Borussia Dortmund at Wembley to complete the treble of European, Bundesliga and German Cup titles in the 2012/13 season.

However, after Carlo Ancelotti was sacked in the wake of Bayern’s 3-0 hammering at Paris Saint-Germain three weeks ago, Heynckes came out of retirement to return as head coach until the end of the season.

After four years out, Celtic’s visit to Allianz Arena is Heynckes’ first real test as Bayern look to show reaction from their thrashing in Paris.

Polish striker Robert Lewandowski, who has scored six goals in five matches at the Allianz Arena this season, said Heynckes has already made an impact after just a week back.

“He wants us to focus on the details. In training sessions, every pass and every shot is important,” said Lewandowski.

“We have to remain focused. We need to go forward together as a team and have fun.”

Lewandowski is Bayern’s most successful foreign goalscorer, with a total of 24 goals, and has scored 10 times in his last 12 Champions League matches.

The striker has made no secret of his desire to win the Champions League title this season.

With three points from their first two games, Bayern need a home win to get them back on track in Group B.

“It’s a very important game for us,” admitted Lewandowski, who scored in Saturday’s 5-0 thrashing of Freiburg in the Bundesliga.

“Three [Champions League] points after two games is not enough for us.

“Now, we have to go from one win to the next.”

Heynckes, in his fourth stint at the club, made an instant impact in his first match in charge as Bayern crushed Freiburg.

The 72-year-old, who led Bayern to the 2013 Champions League crown in a treble-winning season, wants an equally explosive European performance against the Scottish champions.

“Bayern have big ambitions in this competition. It would be good to pick up from our performance on Saturday,” Heynckes said.

“Celtic are a fighting team. They have won their league six times in a row. But we are highly motivated. Obviously, there is always pressure at Bayern but I think the team and me have enough experience to handle that.”

Bayern will be without defender Javi Martinez, whose shoulder injury will keep him out for the next two matches. Bayern are also missing injured winger Franck Ribery and keeper Manuel Neuer.

“I am no friend of playing injured players,” Heynckes said. “The risk of further injury is too great. Javi will miss the next two matches.”

Bayern’s defensive midfielder Javi Martinez has been ruled out for the Celtic match after suffering a shoulder injury in the Freiburg win.

The victory was Heynckes’ first match back in charge and left Bayern second in Germany’s top competition.

However, Brendan Rodgers’ Celtic could throw a spanner in Bayern’s works with the Glasgow club also on three points having won 3-0 at Anderlecht in their last European match.

Former Liverpool coach Rodgers, 44, has turned around Celtic’s away form in Europe since taking charge last year.

They are unbeaten in their last three Champions League games away from Celtic Park with draws last season at Borussia Moenchengladbach and Manchester City followed by the 3-0 win in Belgium.

Chile midfielder Arturo Vidal says Bayern need to beat Celtic at home.

“I always respect our rivals but Bayern is obliged to be in the next round. That’s normal for us,” said Vidal.

“The challenge for us is to actually get to the final and win it.

“PSG are a main rival and the leader of this group.”