A Downing Street spokesperson said talks with Syrian rebel military leaders will help the UK "better understand the actual situation".
The spokesperson said:
The Government will make absolutely clear to these groups that they must respect human rights and humanitarian law standards.
We will also call on them to work with aid agencies to facilitate vital humanitarian access."
The comments came after the Prime Minister visited Jordan's border with Syria.
Prime Minister David Cameron said Syria's President Bashar al Assad should face "full international justice" for his "appalling crimes".
The Prime Minister has faced questions about his promotion of arms deals during a three-day tour of the Gulf region that started today.