Kiev have won one of their opening three group matches, a 2-0 home success over Dinamo Zagreb, but lost their two away fixtures at Paris Saint-Germain and against Porto at the Dragao.
Blokhin has revealed he will send his side out to attack the Portuguese champions and look to secure another win.
"No matter how the game unfolds we must play to win," he said.
"We have another chance to get out of the group is but we have to win. If the opportunity is there to counter-attack, we will try to take advantage of it."
Serbia international midfielder Milos Ninkovic echoed the comments of his manager but reckons the Dynamo players will not feel under pressure.
"We have a chance," he said
"Everything will depend on tomorrow's [Tuesday] game. If we win tomorrow [Tuesday], we will have a good chance of reaching the group stage, "We have played so many of these important games. We are all adults, everyone knows what these games mean to us, for the fans, for everybody."
Porto coach Vitor Pereira is also setting his side out to win the game and can understand why Dynamo are also desperate to collect three points.
"We have nine points and we want to leave here with 12, we are don't go anywhere to play for a draw," he said.
"It is natural that the Dynamo coach feels that they have to risk more to win. Risk is natural because he feels that if they fail it will jeopardise their progress."
Despite winning their opening three games in the group Pereira is not taking qualification for granted.
"On the horizon is only the start of tomorrow [Tuesday] and to achieve victory," he said. "We want to be faithful to our style. We have to be aggressive but at the same time have security in our game."