The Dutch coach is aware of Portugal's strength, but still wants the full three points...
"It is really unbelievable that Portugal are only the fourth side in the group. They are by far the best team in the group, but they have somehow failed to deliver so far," Koeman was quoted as saying by Voetbal International.
"It is crucial for us to be focussed for the entire 90 minutes on Wednesday evening. We can't afford to allow them too much space. However, we should not forget that we have a three-point lead at the moment.
"I would be delighted to see us beating Portugal and double our lead as a result. We still have a chance to qualify for the World Cup finals if we manage to shrug off Portugal."
Koeman's side were unfortunate to be left empty handed by Sweden last weekend, losing 2-1 due to Zlatan Ibrahimovic's goal in stoppage time.
Stefan Coerts, Goal.com