Lennart Thy will miss a week's training with VVV Venlo and the Dutch side's next league game in order to help a leukemia patient.
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Johannsson struck in the 78th minute to secure a point against Gladbach as a substitute.
American forward Aron Johannsson scored the equaliser as Werder Bremen rallied from two goals down to draw 2-2 at Borussia Monchengladbach on Friday.
Defeat in the Nordderby at Bremen's Weserstadion would push Hamburg closer to their first-ever relegation from the Bundesliga.
American striker Josh Sargent has signed his first professional contract at Werder Bremen on the day of his 18th birthday.
Orlando City has acquired Senegal international center-back Lamine Sane from Werder Bremen.
Johannsson, 27, had not started a Bundesliga match since September 2016 until Florian Kohfeldt decided to play him on the wing.
U.S. international Aron Johannsson is set to make his first start for Werder Bremen since September 2016.
Bayern Munich defender Marco Friedl has joined Bundesliga strugglers Werder Bremen on loan until the summer of 2019.
Thomas Muller reached a century of Bundesliga goals as Bayern Munich fought back to beat Werder Bremen 4-2.
Not content with being a professional footballer and a pro-standard poker player, Werder Bremen forward Max Kruse has added a third string to his bow.
American striker Josh Sargent will begin training with Werder Bremen's first team next week, coach Florian Kohfeldt says.
Arsenal have completed the signing of 20-year-old Greek defender Konstantinos Mavropanos from PAS Giannina.
Borussia Dortmund's awful run continued on Saturday when they were beaten 2-1 at home by Werder Bremen to heap further pressure on manager Peter Bosz.
United States youngster Josh Sargent says he has wanted to play football in Europe since he was "a little kid" as he looks set to join Werder Bremen.
ESPN FC's worldwide editorial desks nominate their top performers from the weekend's action. Werder Bremen forward Max Kruse is this week's No. 1.
Werder Bremen are placing their trust in former under-23 coach Florian Kohfeldt to lead the side as coach at least until the end of the year.
Sebastien Haller scored a late winner to earn Eintracht Frankfurt a 2-1 victory over struggling Werder Bremen.