The Daily Mail says Poyet is exploring ways to bolster his side, who sit five points adrift at the foot of the Premier League table, and has identified vastly experienced Cesar as someone who could trigger a revival.
The 34-year-old has been told he can leave Loftus Road and wants a move to ensure his place in the Brazil side for this summer's World Cup.
QPR would prefer a permanent transfer but Sunderland boss Poyet wants to push through a loan deal until the end of the season and take over Cesar's wages.
Worried about World Cup accommodation prices? Then check out the Favela Experience - the answer to your problems!