City were hot favourites to win, but despite an early onslaught on the Groclin goal, the Poles came back to secure a draw and an away goal.
The Blues now face a do-or-die game in sub-zero temperatures – in fact the kick-off has been brought forward to 4.15 pm local time (3.15pm GMT) to lessen the risk of freezing. Nonetheless, Keegan believes the tie is wide open, especially with both sides being attack minded.
"Whether they are a team that can play for a 0-0 at home, I am not sure,” said the City manager. “I am not sure we are a team that will go away and not create chances. It is all to play for and we will go there, as we always do, with optimism.''
On last night’s game he said: "We had a good start, created some good chances and missed some good chances. Then we relied on David Seaman to keep us in it a little bit because he made two great saves.
"If you are a Manchester City fan you will be disappointed, but so am I and so are the players. At home, 1-1 is not a great result. But fair play to Groclin, apart from the first 10-15 minutes, they looked an attacking side. They didn't just come and sit back. They got a draw, I think, they deserved."
Richard Dunne also praised the Polish side’s performance. “It was a tough old game and Groclin made things difficult for us," he told the official club site.
"We missed a few chances and they kept digging away. They had a spell in the second half where they had possession and it gave them confidence.
"A draw was probably a fair result,” he added. “The manager told us at half time the danger of missing chances but after the first half I thought we would end up having it easy. We just didn’t take one of those chances.
"They scored a goal that we could do absolutely nothing about and it is going to make the second leg difficult for us. It will be freezing there and I think the orders have already gone in for our tights!" joked the Irish defender.
"But we won’t be going over there frightened. Our away record has been pretty decent this year and we are confident that we can get the result we need to finish the job off."