Milan currently sit 19 points behind Roma in the table but Constant is positive that they can claim a win at the San Siro, as they aim to qualify for next season's Champions League.
"Roma are a strong side, they play well and I am certain they will keep Juventus on their toes right to the end of the season," he told Tuttosport.
"I believe we can repeat the march from the second half of last season, when we came back to qualify for the Champions League.
"We are a strong side and were penalised in these early months by injuries and a lack of concentration."
Milan have only won four of their first 15 Serie A fixtures this season.