Neil Lennon has criticised his side's finishing after Celtic's 0-0 draw with Sion in the Europa League.
Strikers Georgios Samaras and Anthony Stokes both missed chances before being substituted in the play-off tie first leg.
"Our play in the final third was poor," Lennon said.
"The chances we did create were decent chances that we should have had somebody on the end of. We missed some really good chances tonight."
Samaras survived until the 83rd minute, while Stokes was replaced by Shaun Maloney with 20 minutes remaining.
The Celtic manager is hopeful that Gary Hooper will be fit to play up front in the second leg next week and insists improvements will have to be made if the Glasgow side are to progress to the group stages.
"My expectation is that it is going to be difficult," Lennon told BBC Radio Scotland.
"I think we can score, but we'll have to better in the final third than we were tonight.
"We'll have to be resolute, but I think Sion will probably change the way they play and probably be a bit more open, so that may plan into our hands.
"The plus side is that we kept a clean sheet.
"We hopefully will have Hooper, Kayal and Wilson back, so we may be stronger next week going into the tie.
"But some positions we took up were poor, our final ball was poor and some of our decision-making was poor.
"That's the frustration of it and you want to take some sort of lead to Switzerland, particularly with our away form in Europe, but the tie is far from over."