Lindberg is now suspected of several new rapes, and for pimping offences stretching over an extended period of time.
The prosecutor requested on Thursday that the former police chief continue to be held in custody.
"I have extended the duration of the investigation," prosecutor Håkan Roswall told news agency TT.
The new suspicions relate to a series of further incidents: a rape on January 31st 2007, rape and sexual coercion on January 12th 2010, rapes during April and May 2009, and pimping from October 1st 2006 to September 30th 2009.
Lindberg is already on remand for a series of other sex crimes and the investigation, already large, is continuing to grow.
"There are a lot of people to interview, among others the police chief. So there is a lot left to do," Roswall said.
Asked if there were suspicions that any further crimes had been committed, Roswall replied:
"There are, but I currently do not have sufficient evidence to go to the court with them," he said.
The pimping charges are considered to be of a particularly serious nature.
"It concerns exploitation, which is considered more serious than promotion. He has gained financially," Håkan Roswall told TT.
Roswall stated that there are at present no further suspects.
"There is no prerequisite of a fixed network in these types of cases, and there is no indication that there has been in this case either," he said.
The prosecutor has requested that the remand hearing be set for Friday and that the former police chief be held in custody until March 25th.
"His position is the same - he denies the charges," said Karl Halring, Göran Lindberg's lawyer.