The court adjourned for two days today after state prosecutor Gerrie Nel said the prosecution had completed its case.
Pistorius's lawyer Brian Webber said it was "likely" that Pistorius would take the stand.
"I don't think we have a choice, it's a question of when," he said.
When asked whether Pistorius will testify on Friday, Kenny Oldwage, another of his lawyers, said "we'll see about that".
The 27-year-old athlete's defence requested the break to consult witnesses not called by the state.
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Prosecutors have charged Pistorius with Steenkamp's preplanned murder.
But the Paralympian says he shot at her four times through a locked toilet door after mistaking her for an intruder.
The court heard evidence from a prosecution witness yesterday that Steenkamp was sometimes afraid of her boyfriend.
But the defence drew attention to messages in which the couple used pet names such as "angel" and "baba", and presented CCTV footage of the pair kissing.
"You are an amazing person with so many blessings and you are more than cared for," Steenkamp told Pistorius on February 13th via messaging service WhatsApp the day before she died.
The model and law graduate had planned to cook Pistorius dinner on Valentine's Day, but was shot dead by the athlete in the early hours of the morning.
Police technology expert Francois Moller gave details of the couple's phone records, which revealed several calls were made from the 27-year-old sprinter's phone in quick succession after the shooting.
The first call was at 3:19 am (local time) on February 14 to a manager at his residential estate in Pretoria and an ambulance and his estate security were then telephoned.
"There was a disagreement, unhappiness but if you look at the messages, it was resolved very quickly," he told the court.