Copenhagen - FC Porto missed a chance to guarantee its place in the knockout stages of the Champions League after being held to a 0-0 draw in Group G by FC Copenhagen on Tuesday.
The Danes can advance in the second spot if Porto only draws against Leicester in the last round and Copenhagen beats last-placed Brugge.
Both teams would be on nine points with Copenhagen having a better head-to-head record.
Copenhagen started aggressively with Benjamin Verbic looking dangerous, while Ludwig Augustinsson and Andrija Pavlovic had shots blocked.
For Porto, Andre Silva and Diogo Jota also threatened.
After half-time, Copenhagen lost the initiative, allowing Porto's Maximiliano Pereira, Silva, Jesus Coruna and Jota to keep goalkeeper Robin Olsen busy.
It was always going to be a tough task for Porto with Copenhagen now unbeaten at home for 33 matches over 15 months.
The third-placed team out of the two clubs is guaranteed a spot in the Europa League.