Celtic buy midfielder Baur from Paderborn

Mika Baur has celebrated promotion two seasons in a row [Getty Images]Celtic have signed German midfielder Mika Baur from Paderborn for an undisclosed fee.The 22-year-old, who has signed a four-year contract with the option of another year, helped Paderborn end a six-year absence from the Bundesliga after finishing third in the second tier last season.Salem-born Baur had joined Paderborn from Freiburg, where he played for their second string, two years ago.He made 36 appearances last season, inc