The Nerazzurri president has warned that the club will have to sell before they buy in the January transfer window but insists they are exploring options to strengthen the side
The Nerazzurri currently sit sixth in Serie A and have lost their last two games following the Christmas break against Lazio and Udinese.
Despite their dip in form, Thohir - who completed his takeover at the club towards the end of 2013 - has indicated Inter will need to sell players before they are in a position to add to the squad.
Speaking to Indonesian media, he said: "We do not want to do as other clubs who proclaim purchases and do not conclude [them]. Before we buy we have to sell.
"In January we will have to review the team. There are roles where we have many players and others in which there are not. We are looking for players at positions that are lacking."
Inter crashed out of the Coppa Italia on Thursday, losing 1-0 to Udinese, after losing by the same scoreline to Lazio just three days earlier in the league.
However, Thohir remained composed on the club's future.
"The project is very clear, there is no doubt about this. We want to build a healthy, competitive and interesting club," he added.
"This is a year of transition. It is the year zero, it is the last year of a fantastic era.
"The market consists of a series of opportunities. The fans may not expect bombs, but if we have the chance we will make something interesting."
Inter could move into fifth place in the league with a win over Chievo on Monday night.