The performance of Inter Milan has been decent in Serie A. They are in the second position. Currently, they are three points ahead of the third team on the table. At this moment it is highly unlikely that there will be able to get close to the first team on the table, Napoli.
In the Champions League, the performance in the last match was well. But I have to say I think they were able to score towards the end because, in the 78th minute, Porto had a red card. That paved the way for Inter Milan to score in the 86th minute.
To catch Napoli's points in first place in the standings I think is very difficult and almost guaranteed it won't happen, because Napoli are in the best condition right now in Serie A, 15 points is a big number to be chased by Inter Milan, Roma and AC Milan. The only more realistic hope is to maintain consistency and finish in second place this season for Inter Milan, especially since the points gap with Roma and AC Milan is very close, so there is a chance to be shifted if they are not consistent. Inter Milan will travel to Porto headquarters in the second leg, a one goal advantage has not put il Nerazzurri in a safe position.
Porto still has a chance to win the game in the second leg, because one goal is not a big number and they are playing in front of their own audience. Inter Milan must be wary of Porto's comeback in the second leg, if you don't want to lose and fail to advance to the next round.