Both players were struck down with knee injuries during the Dragons’ 18-10 victory over Cronulla at Wollongong on Sunday
Stanley was stretchered off with a suspected ACL tear.
“Kyle has had a high-velocity twisting injury to his right knee and that’s always a concern,” Dragons Performance Director Andrew Gray told the club’s official website.
“We are reluctant to say much more but he will have an MRI-scan on it and we will be able to confirm the diagnosis then.”
Fien also suffered a knee problem and will undergo scans but Gray said medical staff are “not too concerned” about the veteran utility.