Are Celtic reacting quickly enough to 'wake-up call'?

Martin O'Neill says last season was a "wake-up call" for double winners Celtic - but are the club acting quickly enough this summer?In his first interview since being appointed permanent manager on a one-year contract, the 74-year-old has admitted he is expecting "a tough old time" for the Scottish champions in the new campaign. After Celtic capped a title race for the ages with a dramatic final-day win over long-time leaders Hearts to retain the trophy, O'Neill is braced for another torrid batt