Sevilla midfielder Duda has challenged his team-mates to focus on the Sunday's Andalucian derby game against Recreativo.
Sevilla face Arsenal in the UEFA Champions League on Wednesday and Duda is concerned that the trip to London could distract them from the task in hand.
"Everyone must focus on the game on Sunday first," he told Marca.
"What is most important is to stay as high as possible in the league table. After the game we can start to think about the Champions League.
"Recre will try to make things very difficult for us, but we have out strengths and if we play like can then we should win.
"Every game from now on is vital because we have a game in hand already in the league and we cannot let the teams above us move away."
Duda has been in fine form in the opening games of the season as he helped Sevilla to win the Spanish Super Cup, qualify for the Champions League group stage and beat Getafe in the first league game.
That form has led to pundits calling for the 27-year-old to be recalled to the Portugal squad, but he knows he will have to continue playing well to attract the attention of Luiz Felipe Scolari.
"I am working hard and have had a good pre-season with the team and believe that I can maintain this form," Duda explained.
"Every player wants to work toward playing for their national team.
"I am doing everything I can to earn a recall, but I have to focus on my club first."