The Uruguayan striker, winner of the Golden Boot at FIFA World Cup in 2010, was sent off in the first leg in Kolkata after getting two yellow cards and will sit out of the semifinals second leg at Mumbai Football Arena where he had ripped apart Kerala Blasters with a superb hat-trick earlier.
In fact, four of Forlan's five goals this ISL season have been scored at this venue. To put matters in perspective, Mumbai City FC have not won a single game without Forlan, including a 1-1 draw against ATK earlier at the same venue.
"It's difficult for me to predict now whether we will suffer in Diego's absence. After the game we can talk about that. In the games that he did not play, like against ATK, we performed well. The one who is going to play in Diego's spot, I don't have any doubt that he will do the best to help us get through (to the final)," said coach Alexandre Guimaraes.
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"The players are excited to play in front of our fans, who have been great. I hope tomorrow, we have a full stadium and the fans will push our players to the limit. We have to play smart. We don't have to be suicidal (with our game)," said Guimaraes.
The visitors will have an advantage as they need only a draw to book their tickets for Sunday's grand finale in Kochi, but coach Jose Molina said they will not pack the defence and protect their win in Kolkata.
"Nothing changes for us because of the result in Kolkata. We will not play in a different way. Of course, we know we have a small advantage and we have to keep calm but everything depends how the game is going on tomorrow," said Molina.
Interestingly, they have collected just eight points at home, the least among all semi-finalists in ISL history, but their patchy home form meant they have been strong away, winning more points away from home (12) for the first time in ISL history.
"To lose only two games out of 15 (in the league) is something really good but tomorrow is a different match. What we did in the past is not important. If we go to the final, it will be because tomorrow, we will play a good match, not because of what we did before. I live in the present not past," said Molina.