Bayern head coach Hansi Flick has made it clear he wants to add to his depleted squad and defender Kimmich believes it is vital they bring in some new faces this month.
"At the training camp in Doha you can see that we've actually only got 12 or 13 professional players in the squad and the rest are youth," said the Germany international.
"The table for the youth players was full. That wasn't the case during my first year at Bayern.
"We might play until the end of the season in all three competitions and we have lots of international players too, so we need more players who are fit.
"Of course we have a lot of injured players. Gnabry couldn't train, Lewandowski and Coman will return soon.
"[Javi] Martinez also has a knock and [Niklas] Sule and [Lucas] Hernandez will take time. The club know that so they have to make a decision. At the moment, the squad is not big enough."
The Bundesliga champions are four points off the summit at the midway point this season and will return to league action with a trip to Hertha Berlin on January 19.
Flick recently requested the club sign one or two more players in January with sporting director Hasan Salihamidzic surprised by the manager's comments.
For Flick, however, he was just being truthful as he looks to ensure Bayern can enjoy a successful season after initial struggles.
"I have honestly given my opinion and given professional reasons. I am always concerned about the club," Flick told reporters on Friday.
"We all have high goals and must create a basis to be able to achieve these goals. The injury situation is bad. You can't influence that. The winter period is there to regulate certain things. It was just my concern to express it that way. The players will certainly not see it any differently.
"I do not want to comment and interpret [Salihamidzic's reaction]. It is simply due to the situation. I see my team and the club, we want to play successfully. That is my focus. I have no problem with that."