Farah has been dumped to reserve grade and is set to be forced out of the Tigers at the end of this season, with a year left on his contract, after falling out with head coach Jason Taylor.
Ellis spent four seasons at the NRL club, from 2009 to 2012, making 75 appearances.
Farah is a local Tigers junior who has been with the joint-venture since making his first-grade debut in 2003.
“I was disappointed to see what’s happened with Robbie,” Ellis told Love Rugby League.
“I don’t claim to know the ins and outs of the whole situation and the dynamics of running a club, that’s probably what it falls down to at the end of the day.
“But obviously he’s a good friend of mine Robbie, and I probably think he probably deserves to go out in a better way than what he’s been treated at the minute.”
Ellis had a successful stint with Wests and won the club’s Player of the Year award three times.
In both 2010 and 2011 the English forward and the Tigers got to within one game of the grand final, but were edged by the Dragons and then the Warriors.
“We were that close and it was a great team,” Ellis said.
“A lot of that team that were young lads playing in 2005 [when the Tigers won the grand final] as well, so I’ve got fond memories of that and Robbie was a big part of that.”