Photo Artis and Gossip

Pilar Sanders called cops to Deion‘s gargantuan Texas mansion yesterday … claiming she was ATTACKED by one of Deion’s female friends … while the NFL legend stood by and watched.

Law enforcement sources tell TMZ, Pilar told officers a woman named Laura arrived to the mansion to see Deion … but Pilar told Laura she was not welcome in the home and asked her to leave.

We’re told Laura refused … and after some words were exchanged, Laura threw an object at Pilar … striking her in the eye.

Pilar grabbed her phone and called 911 … and told police Deion was present during the altercation, but didn’t do ANYTHING to diffuse the situation.

Cops tell TMZ … no arrests were made and the situation is under investigation.

We called Pilar’s people and Deion’s people for comment — so far no response from either camp.

9:24 AM PT: Pilar’s lawyer tells TMZ, “Pilar was taken to the hospital emergency room as a result of the injuries she sustained during the assault.”

The lawyer adds, “This is an opportunity for Deion to use his ‘Century-21 celebrity status’ to set an example as to how to lovingly care for his wife and children during divorce proceedings.”