"Anxiety affects everyone differently," he explained to the Guardian. "It started in February and it lasted until the summer.
"When the Euros came I decided I couldn't go, that I had to isolate myself.
"Everyone at the federation knew."
Carles Puyol knew too and promised to help the teenager through the tournament, but Bojan simply couldn't.
"I said, 'Puyol, I can't'," he revealed.