Chris Sutton has come to the defence of Celtic midfielder Matt O’Riley and shut down the theory that his head has been turned by transfer interest earlier in the season. O’Riley was the subject of intense speculation in the lead-up to and during the winter transfer window with Celtic’s UEFA Champions League opponents Atletico Madrid said to have tabled a bid for his services. The Danish international was in incredibly hot form in the first half of the season but hasn’t reached those levels since the winter break. Some critics have put two and two together, suggesting that the reason for his dr…