Bayer Leverkusen midfielder Florian Wirtz is set to return "earlier than expected" from an ankle injury, coach Xabi Alonso told reporters on Friday.
Bielefeld, who have never made a German Cup final, became just the fourth third-division team to reach the showpiece event.
A 10-man Bayern Munich went unpunished for a shock 3-2 home defeat to Bochum on Saturday after title chasers Bayer Leverkusen were beaten 2-0 by Werder Bremen.
Harry Kane struck twice as Bayern Munich eased to a 3-0 home win over 10-man Bayer Leverkusen on Wednesday, putting them on track for the Champions League quarter-finals.
Bayern Munich coach Vincent Kompany on Friday compared his side's current duel with Bayer Leverkusen to the Manchester City-Liverpool Premier League battles of his playing days.
Given the scope of last year's achievements, where Alonso took Leverkusen to an unbeaten league and cup double in Germany, Carro's tongue-in-cheek quip is believable.
Bayern Munich coach Vincent Kompany and his Bayer Leverkusen counterpart Xabi Alonso on Friday joined the growing chorus calling for action on player workload, amid talks of strikes.
"It may have looked pretty easy, but it's really not," Alonso told reporters after his team cruised to four first-half goals to break the Dutch resistance.
Bayer Leverkusen's 35-game unbeaten Bundesliga run came to an end in their last game and manager Xabi Alonso hopes the short time he has had with his players will be sufficient to get back to winning ways.
Bayer Leverkusen had won only two major trophies in their 119-year history before this season but on Wednesday the newly-crowned Bundesliga champions have the chance to claim a double when they face Atalanta in the Europa League final in Dublin.
Bayer Leverkusen's Florian Wirtz has been voted Player of the Season in the Bundesliga, the German League said on Monday, after the midfielder helped his club in winning their first league title.
Alonso's men, who have a Europa League final against Atalanta and a German Cup final versus Kaiserslautern to come this week, have not lost in any competition this season -- a run of 51 games.
Champions Bayer Leverkusen edged past Augsburg 2-1 on the last matchday on Saturday to become the first team in the history of the Bundesliga to complete a full season without a loss.
Bayer Leverkusen stretched their season-long unbeaten run to 50 games with a 5-0 win at 10-man Bochum on Sunday.
Under the banner "love that lasts a lifetime", Leverkusen announced the "special promotion for the end of a special season".
Leverkusen, the Bundesliga champions who have also reached the May 25 German Cup final, played their 49th match without defeat in all competitions, surpassing Benfica's long-standing European record set from 1963 to 1965.
Xabi Alonso's Leverkusen, who have 40 wins in their unbeaten run, face Atalanta in the May 22 final in Dublin after the Italians comfortably got past Olympique Marseille.
Xabi Alonso's rampaging Bayer Leverkusen will have an additional incentive in Thursday's home second-leg Europa League semifinal against Roma: breaking a 59-year-old European football record.
Bundesliga champions Bayer Leverkusen extended their season-long unbeaten run to 48 games with a 5-1 win at Eintracht Frankfurt on Sunday.
