The forward will need another operation, this time on his knee after injuring it in training, as he aimed to come back from an achilles operation.
Coach Phil Veivers says it is only a slight setback for the Aussie forward, who was just back in training, following his close season surgery.
“Latu was training and twisted his knee so there is some cartilage debris in there that needs taken out,” explained Veivers.
“A lot of that comes from him over compensating on that leg while looking after his bad leg.
“He has seen a specialist and the report says he will need a clean out so that will put an extra week on his rehab. His achilles seems to be as strong as before so it is now up to him to develop strength and work o his fitness so he will be ready to go.”
Tongan international Fifita joined Workington in time for the 2015 season from Queensland Cup side Northern Pride who had won the NRL State Championship the previous year.
But he has been dogged by injuries, also needing an operation on damaged knee cartilage mid way through last season.
Town could welcome back Callum Phillips for the Oldham clash, with Jamie Doran also in contention but there is a slight doubt over Karl Olstrom.
Veivers added: “Karl Olstrum had someone land on his ankle in the first carry last weekend and he twisted it. But he has iced it up this week and we will see how he goes in training.”
The match could see some milestones hit by Town, with Carl Forber just nine goals away from reaching the 500 mark for the club.
And hooker Graeme Mattinson will make his 100th appearance in Town colours if he steps out against Oldham.
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