Grenoble coach Bernard Jackman said Marler's bootwork "was just a daft thing to do" and Harlequins rugby director Conor O'Shea said Marler would be disappointed but "when you are a marked man you are a marked man."
Meanwhile Daniel Carter steered Racing 92 into the European Champions Cup after a 19-16 win against Leicester. The former All Black first five kicked 11 points and guided his side around the park in a rugged contest which sent Racing into Europe's premier club final against Saracens.
"It's an amazing achievement. This competition was a big part of the reason I wanted to come and play in France. We knew it would come down to the last minute because Leicester are a quality side, very fit," the 34-year-old Carter said.
"Winning the final would be a dream come true. It's been an amazing four and a half months, but that would top things off. Saracens are a quality side, the form side of the tournament, but I'm looking forward to it."