LEIPZIG, GERMANY - OCTOBER 25: Ralf Rangnick, Manager of RB Leipzig looks on during the UEFA Europa League Group B match between RB Leipzig and Celtic at Red Bull Arena on October 25, 2018 in Leipzig, Germany. (Photo by Martin Rose/Bongarts/Getty Images)

RB Leipzig boss Ralf Rangnick believes that his side’s 2-0 Europa League win over Celtic came about due to their hard work off the ball

The Bundesliga side claimed a convincing 2-0 victory at the Red Bull Arena through goals from Matheus Cunha and Bruma.

In what Rangnick previously described as a must-win game, Leipzig are now three points above Celtic in second-place in Group B.

And now Rangnick has got his sights fixed on Sunday’s league game with his former club Schalke 04.

KILMARNOCK, SCOTLAND - FEBRUARY 17: Connor McAleny of Kilmarnock vies with Kristoffer Ajer of Celtic during he Scottish Ladbrokes Premiership match between Kilmarnock and Celtic at Rugby Park on February 17, 2019 in Kilmarnock, Scotland. (Photo by Ian MacNicol/Getty Images)

Ajer over the moon following dramatic Celtic victory

The Norwegian footballer was happy his side defeated Kilmarnock 1-0 at Rugby Park, on Sunday's Scottish Premier League fixture.

“After the first 20 minutes, we had control of the game just as we had planned. The team worked very hard off the ball, which was the key to our win today,” Rangnick told the club website.

“Now we’re fully focusing on the game on Sunday against Schalke. We know that a tough match awaits us. Schalke are in the bottom half and want to change that, but we want to keep fighting near the top!

“I’m sure that a lot of the players who were absent today will return for the game at Celtic Park. There’ll definitely be a great atmosphere there, and I hope that a lot of fans will travel to support us in Scotland.”

The return fixture between Leipzig and Celtic will take place at Glasgow on November 11.