Mysterious Pain: Carrick finds out why he's missing United.

Manchester United football player Michael Carrick has discovered what was a mystery for so long. And his problem seems to be quite disturbing.

Carrick said he was missing the cause of heart problems. The 36-year-old in his letter said he had not felt well in Carabao Cup during September. And after all the tests he had done, he found that he had a steady heartbeat. So he was diagnosed with the problem in question.

In his statement, he said he's working hard to heal and he'll be back in the green field soon.