Hearts job not a poisoned chalice, says John Robertson in wake of Paulo Sergio departure In fact, in most countries the director of football's the man that actually signs the players and the coach is given the players to get on with the job. We've slowly got used to the fact that, at Tynecastle, there is a degree of advice given from certain areas and the managers tend to get on with it now. Robertson believes "drastic budget cuts" meant retaining Sergio was always going to be difficult. "This is a significant move from Hearts that they're cutting back," he said. It's disappointing because I'm sure everybody at the club would've loved to have seen Paulo Sergio build on last season's Scottish Cup win. I think he was on a substantial contract at [former club] Sporting Lisbon and Hearts were paying some of that and Sporting Lisbon will still be paying a huge amount of his wages until the end of the season. We know there's going to be drastic budget cuts at Hearts and there's going to be a lot more young players but I'm sure they'd rather have had him at the helm. They have been living beyond their means in the last four or five years. They've decided that they can't do it anymore, that they have to be sustainable and live within their budgets. Cha Du-ri has left Celtic to join German outfit Fortuna Dusseldorf, the Scottish champions have confirmed. The South Korea defender's departure signals the end of a spell of almost two years with the Hoops. He arrived in the east end of Glasgow from Bundesliga side Freiburg in July 2010 and now returns to the country of his birth. A statement on Celtic's official website confirmed: "Cha Du-ri has signed for Fortuna Dusseldorf after spending nigh on two years with the Hoops. The German-born South Korean internationalist returns to football in the land of his birth after making 44 appearances for Celtic, during which he scored twice. Everyone at the club would like to wish Cha every success in his future career.