Udinese's Champions League hopes are fast slipping away.
"We missed a good chance to get a result," admitted Guidolin. "Siena played better in the first half, while we improved after the break and were only unable to score.
"Once again today we showed that we are in good physical shape, but are not sharp. There are some difficulties, but we are not dead yet and if we are in Europe next season then there's only reason to celebrate.
"We still have the strength to get the claws out in these final weeks and cling to the European places, as it'll probably be decided in the head-to-head meetings."