Harlequins prop Marler appeared to kick Grenoble hooker Arnaud Heguy in the head on Friday night during the London club’s 30-6 win at The Stoop that sent them into the European Challenge Cup final.
Saracens centre Farrell is alleged to have committed a dangerous tackle on the Wasps scrum-half Dan Robson on Saturday as Sarries reached the Champions Cup final with a 24-17 win at the Madejski.
A statement yesterday from European Professional Club Rugby (EPCR) also revealed Wasps prop Simon McIntyre had been cited for allegedly kicking Saracens second-row Maro Itoje during the contest.
Marler was on Friday playing his first game back after his two-match ban for his ‘’Gypsy boy’’ slur against Wales’ Samson Lee.
Regarding the 26th-minute tussle with Heguy on Friday, Quins boss Conor O’Shea said: ‘’Should he do it? No. Is it a red card? No.
“We never condone it but if that is a red card there’s a heck of a lot of things that happen on the pitch that are worse. ’When you’re a marked man you’re a marked man.
‘’People probably look more for things when Joe Marler’s involved than with others, but that’s life.’’
If Marler is found guilty, the low-end punishment is a four-week suspension, with that doubling for a mid-range ban, while the top-end punishment is a year.
In the case of Farrell, who was shown a yellow card on Saturday for his tackle on Robson, the minimum ban is two weeks, with the mid-range punishment six weeks.
It has left Marler and Farrell sweating ahead of their clubs’ finals.