PORT Adelaide midfielder Sam Powell-Pepper has been stood down for Sunday's clash with Essendon at Etihad Stadium for breaking team rules.

The Power released a statement on Wednesday evening, saying the club's leadership group had decided to hand Powell-Pepper a one-game suspension.

However, the AFL investigation into the late-night incident is ongoing.

"Port Adelaide midfielder Sam Powell-Pepper has received a one-game sanction imposed by the club’s leadership group for breaking team rules last weekend," the statement read.

"It has been established that Powell-Pepper was intoxicated and broke the playing group’s time curfew on Sunday morning.

"The sanction means Powell-Pepper will miss Port Adelaide’s Round 4 clash with Essendon this Sunday at Etihad Stadium.

"The AFL is continuing its investigations into an alleged incident involving Powell-Pepper in an Adelaide bar last Sunday morning.

"These investigations are ongoing and the club will be making no further comment until they are completed."