Real Madrid is used to breezing through the Champions League, rather than facing must-win matches near the end of the group stage. (More Football News)
But poor performances this season have left Zinedine Zidane's team needing a victory on Wednesday against Borussia Mönchengladbach to ensure the record 13-time European champions don't miss out on the knockout phase for the first time in the club's Champions League history.
With a draw, Madrid can still squeak through to the round of 16 if Shakhtar Donetsk loses at Inter Milan.
Madrid has never failed to get past the group stage in its 25 previous campaigns. Before falling in last season's round of 16, Madrid had reached at least the semifinals for eight consecutive seasons, winning the title four times in that stretch.
Lionel Messi's latest meeting with old rival Cristiano Ronaldo features as the other main attraction in the last of the group games. Messi's Barcelona hosts Ronaldo's Juventus on Tuesday with both already qualified.
Group B has proven to be the most competitive. Gladbach leads it with eight points. Madrid and Shakhtar each have seven, two more than last-place Inter. All four can still advance, and all four can still miss out.
When Gladbach hosted Madrid in October, the German club was leading 2-0 until Karim Benema and Casemiro scored late to salvage a 2-2 draw.
Madrid's only two wins both came against Inter. It was beaten twice by Shakhtar.
Struggling in attack, Madrid has also had problems in defense, conceding nine goals in five group games, its worst defensive record up to this point in the competition.
A hamstring injury has sidelined defensive leader Sergio Ramos for the last two weeks. Injuries to right backs Dani Carvajal and Álvaro Odriozola have forced Zidane to play a forward, Lucas Vázquez, in their spot.