Trio rob Sydney couple, 77, at knife-point

An elderly couple have been robbed at knifepoint in their home in Sydney's southwest.

The man, 77, was sitting on his verandah at Condell Park just after 2pm on Monday when he was approached by three men.

While one man remained outside, two others, one armed with a knife, forced the victim inside and made him open his safe before stealing a quantity of jewellery.

The man and his 77-year-old wife, who was also home at the time of the robbery, were not hurt.

The robbers have been described as Pacific Islander or Maori in appearance and police have appealed for witnesses or anyone with CCTV or dashcam vision to contact them.