Two middle-aged men stabbed in separate attacks in Sydney's southwest

Two men have been stabbed in separate attacks in Sydney's southwest.

At about 7.30pm on Sunday emergency services were called to a unit in Riverwood where a 53-year-old man had been stabbed.

He was taken to Liverpool Hospital with a chest laceration.

At about 9.30pm emergency services were called to a unit in Campsie to find a 45-year-old man who had been stabbed following a fight with another man.

He was taken to St George Hospital, also with non life-threatening injuries.

Police are seeking three men over the first attack and one man over the second, but say the two stabbing incidents are not linked.