Patrick Mahomes' fiancee Brittany Matthews shows that she is a real team player. Kyle Terada-USA TODAY Sports

Brittany Matthews wasted no time supporting Kansas City’s backup quarterback after her fiancé Patrick Mahomes suffered a concussion.

Mahomes was knocked out of the AFC divisional round playoff game between the Chiefs and Cleveland Browns midway through the third quarter after being tackled on a rushing play. He was taken to the medical tent and then for an examination in the locker room, where he was declared out with a concussion.

Chad Henne stepped into the game for the Chiefs.

Even though her fiancé was out with a serious injury, Matthews was already backing Henne with full enthusiasm.

“LFG” is an acronym for “let’s f—ing go,” so you know she was pumped up.

Henne helped the Chiefs get a field goal on the possession on which Mahomes was hurt, but he was intercepted in the end zone on the following possession. Henne also played in the Chiefs’ Week 17 loss to the Chargers.

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