Petkovic admits Lazio facing must-win game
"We need optimism and clear heads to play this game," warned Petkovic.
"We have been too unlucky in 2013 and need to analyse what went wrong. We must take it one day at a time and give our all to win the next game.
"It is difficult to give a definitive shake-up, as this up-and-down mentality has been going on for months. There should be more positivity from everyone, including the media."
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