Celtic are continuing their efforts to agree a deal to keep Kris Commons at the club beyond the summer.
"We'll see, we're working on it," said Celtic manager Ronny Deila of Commons' contract after his impressive display in the
"Talks go on. In the first half Kris was involved in everything. He worked very hard. In the second half we dropped in intensity."
Commons is holding out for a two-year deal, double what Celtic are offering.
The former Scotland attacker that he was keen to stay with Celtic.
"I feel I've got a lot to offer and hopefully in these next couple of years I can do that," said the 31-year-old after the 4-3 defeat by Dinamo Zagreb.
Commons was heavily involved in Celtic's attacks at Rugby Park as they moved to within a point of Scottish Premiership leaders Aberdeen, and Deila's side still have a game in hand.
He twice struck the crossbar and had several other shots trouble Craig Samson's goal.
"That was very good, the first half especially - good attitude and good commitment from every player," said the Celtic boss, whose team won thanks to goals from Emilio Izaguirre and Stefan Scepovic, one in each half.
"We kept them under pressure. They couldn't keep the ball for two passes and we created the chances we needed.
"I'm happy with the result and the performance.
"We had that little period in the second half when we had too many touches on the ball but we got the second goal and the game was finished."
Kilmarnock manager Allan Johnston lamented the performance of his players in the opening 45 minutes.
"In the first half we never got anywhere near anyone, we allowed Celtic to pass the ball about with no pressure," he said.
"If you allow good players to pass the ball and don't put pressure on them they are always going to cause you problems with their movement and that's what happened.
"I don't think there were any pass marks in the first half, that was nowhere near good enough.
"In the second half we went with two strikers so we could put a bit more pressure on further up the pitch.
"I thought in the second half we were a much better team. We restricted them to very few opportunities. It was a million times better."