AC Milan boss Stefano Pioli believes the results his side get against Porto in the next two Champions League matches will go a long way to determining who goes through into the last 16.
The two sides clash at the Estadio do Dragao on Tuesday evening with Milan available to back at 19/10 while Porto, with home advantage are 7/5 and a draw is priced at 12/5.
Neither side have managed to pick up a win in Group B with the fixture set to be vital in their quest to reach the latter stages.
The Rossoneri have been beaten narrowly in both their games, being edged out by Liverpool 3-2 at Anfield before losing at home to Atletico Madrid last out.
Porto have picked up just one point so far in a goalless draw away Atletico before they were humbled 5-1 by Liverpool at home in their previous match.
Therefore, a win for either side would be hugely beneficial going forward with the two set to meet again in two weeks' time at the San Siro.
Milan have had an excellent start to the Serie A season, picking up seven wins and a draw from eight matches and will aim to carry that form into Europe.
Speaking prior to the contest, Pioli said that while Tuesday's result is not going to be decisive it will have a big impact on the group standings.
"It is very important but it is not decisive yet," he told reporters. "The double meeting with Porto will greatly affect the group table.
"We studied them (Porto) well. They are used to games like this, they have strong and fast attacking players. It will be difficult, but we have our own way of playing that we have to carry on."