After winning 12 of their opening 15 matches of the Serie A season, Luciano Spalletti's side have since failed to win in four.
“The team has the quality to finish in the top four of the table," Portuguese defender Cancelo insisted.
“But our rivals are very strong. Undoubtedly we have the qualities to do it, but I don't know what will happen.
“Inter are a great team and we want to fight for a place in the Champions League.
“I am happy with my performance on a personal level, but the important thing is the team."
Cancelo believes the stalemate with Lazio was a fair result on the balance of play.
“Lazio are a very strong team, I thing it was the correct result.
“We are a very united group, we want to reach our target."