Casserly, who has been in a three-way race for Richmond's final rookie spot, tested positive for pseudoephedrine following last year's WAFL grand final and the WAFL Tribunal upheld the Australian Sports Anti-Doping Authority's recommendation for a maximum ban on Monday.
Swan Districts football manager Phil Smart said the club would decide possibly as soon as Tuesday whether to appeal against the decision either before a WAFL Tribunal panel or through the Court of Arbitration for Sport.
The WAFL has indicated to the club that a Tribunal panel would sit by next Tuesday at the latest should Swan Districts choose that route of appeal, keeping Casserly's AFL ambitions alive.
An appeal through the Court of Arbitration for Sport would take longer, likely ruling the 23-year-old out of the race for Richmond's final rookie list spot, which needs to be settled before the start of the premiership season.
"If we go through the WAFL Tribunal, we've had indications from the WAFL that they will hold it at the end of this week or at the latest, by Tuesday next week," Smart told afl.com.au on Tuesday.
"We have to check what the best avenue for appeal is, and if we do fail with the first appeal. then we've got another avenue to take.
"We'll give him his rightful opportunity to play AFL football."
Casserly claimed in a hearing last Thursday night that he took one 60mg Sudafed tablet before last year's WAFL grand final and one at half-time, under observation of club fitness staff, to combat hay fever.
Pseudoephedrine is a “specified stimulant” which is prohibited when its concentration is greater than 150 micrograms per millilitre. Casserly returned samples of 240 micrograms and 230 micrograms.
"I am satisfied that the high reading of pseudoephedrine found in player Casserly’s urine sample indicated that his use of the substance went beyond the therapeutic to the enhancement of his sporting performance and that is was his intent for it to do so," WAFL Tribunal chairman Paul Heaney said on Monday.
Smart said Swan Districts was "shocked, angry and disappointed" with the decision and would spare no expense in its appeal.
He said the club had received private support from six other WAFL clubs as well as AFL clubs.
"We've had other sports, we've had AFL clubs and we've had people that are involved at WAFL level at very high levels that expressed concern and shock at [the decision]," Smart said.
"It’s very important from our club's point of view to clear Travis of this penalty. It's totally unprecedented to have a two-year penalty for a substance that isn't banned; it's a controlled substance.
"He's been totally transparent in regards to his usage of it. He's used it for a number of years when it wasn't a banned substance, spasmodically depending on his symptoms from his hay fever.
"There's lots of other things that are legal in AFL and sport like caffeine and No-Doz tablets that players can take to enhance their performance if that's what he wanted to do. That wasn't what he wanted to do."
