Celtic missed an opportunity to end their seven-year wait for an away win in the Champions League after being held by a weakened Dinamo Zagreb, but are "gaining confidence" at this level, says manager Brendan Rodgers.
The Scottish Premiership leaders enjoyed almost 70% possession but struggled to cleave out clear chances against a Croatian side hampered by injuries.
Paulo Bernardo and Luke McCowan both threatened from distance, and Adam Idah was denied by a last-ditch tackle, but the breakthrough did not come.
It means Celtic have still not won away from home in this competition since beating Anderlecht seven years ago in Rodgers' first spell.
"Yes, we needed to do more," said Rodgers. "It was an opportunity for us but you have to show a little bit more in those moments.