Roma have only been able to find one full-time defender since the start of the season, and they need to find another one soon.
The club have also had to find space for a number of new faces as the club’s season comes to an end.
It is expected that they will look to recruit another centre-back and a left-back in the summer, with Andrea Barzagli a strong possibility.
Roma have been without a defender for more than two weeks due to an ankle injury, with goalkeeper Giorgio Chiellini and defender Mauro Icardi both out for the season.
“I hope we will be able to add a few players for next season,” Zeman told the club website.
“This is the only way for us to keep the squad competitive.
But I think there are also some problems with our defence, we have to find solutions.
We have to improve and be better than last year.”