"Today is a fundamental day to see," Sabella told his pre-game press conference at Rio de Janeiro's Maracana.

"He has improved, that is obvious. After training, we will know better. Just now I couldn't give you an answer."

Di Maria has not played since injuring his thigh in the first half of Argentina's 1-0 win over Belgium in the quarter-finals.

In the Real Madrid player's absence, Benfica's Enzo Perez deputised in midfield alongside Javier Mascherano and Lucas Biglia in the semi-final victory over the Netherlands.