Ronny Deila says Celtic cannot afford a repeat of their 5-3 defeat to Dukla Prague in their Champions League tie.
Manchester City have had their restrictions on transfer spending lifted and will be able to field a full Champions League squad this season.
UEFA has confirmed that Cardiff's Millennium Stadium will host the 2017 Champions League final.
Scott Brown is frustrated Celtic need to win three qualifiers to reach the group stages of the Champions League.
Porto have confirmed that Jackson Martinez will join Atletico Madrid in a £24.8million deal.
Crusaders and Shamrock Rovers were held to goalless draws in their respective Champions League and Europa League qualifiers.
Celtic midfielder Stuart Armstrong insists they are not feeling the pressure ahead of their Champions League qualifiers.
Celtic have been drawn against FC Stjarnan of Iceland in the second qualifying round of the Champions League.
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