Hertha Berlin have said they do not believe Liverpool will get a work permit for Allan as they prepare to open talks to extend his loan.
Coach Thomas Tuchel had suggested Sahin could miss the rest of the campaign.
U.S. international was given a score of six by kicker -- the lowest in the German football magazine's ratings system.
Bayern Munich captain Philipp Lahm has said now is not the time to be "sentimental" but wants to crown his playing career with a seventh DFB Pokal.
Bayer Leverkusen sporting director Rudi Voller has warned his team to secure a victory as soon as possible to avoid a relegation battle.
Eintracht Frankfurt coach Niko Kovac has praised Mexico international Marco Fabian as "special" after his goals secured their first win in 10 matches.