Speaking to the press on Friday, Koeman was seen wiping blood from his nose several times and attempting to continue before having to leave the gathering.
Reports said it was the second time Koeman, 57, had been afflicted by the problem in recent weeks as some sections of the Barca fanbase expressed their concern.
However, the club confirmed that Koeman was fine and it was later clarified that the issue stems from the Dutchman taking blood thinners for a heart condition.
In May of last year, Koeman underwent a procedure in his homeland after suffering heart problems and being rushed to hospital.
“I went on a 64-mile bike ride, came home a bit exhausted, and when I sat down I started to feel terrible,” he would later reveal.
“I had a pain in my chest, I started sweating and went as white as a ghost. I now see how lucky I was. The paramedics who rushed to come out and took me to hospital in their ambulance were brilliant.”