Both could get touchline bans if found guilty by the Football Association.

Harris was sent off just before half-time after a scuffle on the sidelines in the 1-1 draw at Middlesbrough.

Bilic was shown a second yellow card after remonstrating when Albion were not given a corner late in the 1-1 draw with Derby County.

Both managers have until Friday to respond to their charges - under new rules this season, referees can give yellow and red cards to staff in the technical areas.