Bartra was taken to hospital after three explosions hit the Dortmund bus just after 6pm. The defender was said to be "okay" by reports in Spain.
The fans inside Dortmund's Signal Iduna Park only found out at 7:30pm that the game would be postponed until Wednesday, after being informed of the incident on the stadium's big screens.
Monaco supporters rose to the occasion by chanting the name of their hosts in a show of support.
Read the full article on eurosport.co.uk: VIDEO: Monaco fans chant in support of Dortmund