The complaints were made following last month's Amlin Challenge Cup final defeat to Harlequins.
The ERC said on Monday that the Australian is alleged to have made comments of an insulting/offensive/disparaging/intimidatory nature to match officials during the half-time break, and that he did the same to an ERC staff member after the full-time whistle.
Stade were unhappy with a number of decisions made during the game which they lost 19-18, with Cheika saying in his post-match press conference: "Once again we came undone due to the shortcomings of, you know. I don't think I should say it because I will only get in trouble."
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.