MADRID (AP) — Barcelona is through, and Ajax needs a win in Group H of the Champions League.
With two games remaining, Barcelona leads the Group H with 10 points. AC Milan is second with five points, followed by Ajax with four and Celtic with three. AC Milan visits Celtic in the other group match.
Here are 5 things to know ahead of Tuesday's matches:
Seven-time champion AC Milan remains in crisis mode ahead of its visit to Celtic.
The Rossoneri are on a five-match winless streak in Serie A and haven't won in Europe since beating Celtic 2-0 in the opening round of group matches in September.
Milan's poor form has mirrored that of striker Mario Balotelli, who has gone six matches in all competitions without a goal and failed to convert a penalty kick in Saturday's 1-1 draw at home with 10-man Genoa.
Balotelli raised eyebrows when he tweeted at 5 a.m. Sunday, "This is the end. :-)"
With Milan coach Massimiliano Allegri barely clinging to his job, one of the few bright spots has been the return of Brazil playmaker Kaka.
After an injury-plagued four-year spell at Real Madrid, Kaka is back to a reliable attack weapon and scored the opener against Genoa.
For the trip to Glasgow, Milan is without several players, with center back Philippe Mexes and midfielder Sulley Muntari the latest to join the injured list.
Barcelona will be able to count on midfielder Xavi Hernandez for its visit to the Amsterdam Arena, but fullback Adriano has joined the Spanish champion's growing injury list.
Barcelona is already without forward Lionel Messi, goalkeeper Victor Valdes, defender Jordi Alba and defender Dani Alves, all because of injury. With Adriano's absence on Tuesday, Marc Montaya is the only remaining natural back in defense.
Barcelona coach Gerardo Martino has had to call in four youth team players to complete the 19-man squad. But the Argentine coach is confident his club will adapt as it did in Saturday's 5-0 rout of Granada.
"This team knows how to play in a different way when it needs to," Martino said.
Barcelona, which has yet to lose in 20 matches this season, will win the group even if it loses as long as Celtic beats Milan.
Four-time European champion Ajax desperately needs a win against Barcelona to keep alive its hopes of qualifying for the knockout stage, but the question for coach Frank de Boer is: Where will goals come from?
The defending Dutch champions have an injury crisis in their front line with recent internationals costing Ajax the services of captain Siem de Jong and Iceland striker Kolbeinn Sigthorsson. De Jong picked up a hamstring injury playing for the Netherlands against Colombia and Sigthorsson damaged an ankle in the first leg of Iceland's World Cup playoff against Croatia.