Mišůn's signed for Scottish Premier League side Celtic in December 2008 after they fought off competition from AC Milan[2] and Copenhagen[3] Mišůn was given the number 15 shirt and was eligible to play for Celtic from 1 January 2009. He was an unused substitute in a 4–2 loss to Aberdeen on 18 January 2009.[4]
After returning to Celtic, on 28 January 2011 Mišůn apparently joined League One side Swindon Town for an undisclosed fee[9] - however, it was later revealed he had not officially signed a contract.[10]