The 46-year-old manager believes his side's chances of reaching the Champions League group stages hang in the balance after they were held in Eindhoven despite taking the leadAC Milan boss Massimiliano Allegri has rued his side's failure to take their chances during the 1-1 Champions League playoff draw with PSV on Tuesday.
The Rossoneri took the lead through Stefan El Shaarawy's header in the first half but were forced to settle for a draw after Tim Matavz nodded in an equaliser following a fumbled save from Christian Abbiati.
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He told Sky Sport Italia:"We struggled a little at the start, losing the ball and allowing them easy chances.
"In the second half we controlled the ball better and above all defended better, as in the first half we were too wide between the sections and that allowed passes through.
"It’s a shame, as we had so many chances to seal the win even after the equaliser, so now it’s all open ahead of the second leg.
"If we had won and especially with a two-goal cushion then we would be looking at this match differently.
"Now we have to think about Saturday’s Serie A opener with Verona and only after that worry about the second leg."