Mats were nowhere to be seen on the sidelines during the Chargers vs. Chiefs game on Sunday night ... just days after a Broncos player sued L.A., claiming the previous use of the ground coverings at SoFi Stadium caused him to tear his ACL.
The mats had been there for the Broncos vs. Chargers game back on Oct. 17 -- and during a special teams play in the overtime period of the contest, outside linebacker Aaron Patrick stepped on them and blew out his knee.
In a lawsuit filed on Nov.