Sinisalo is on-loan at Exeter City, where manager Gary Caldwell has been impressed by the Finn.
"I think it's brilliant that a loan player can come and connect with the club like he has," Caldwell told BBC Radio Devon. "I think it shows the power of this football club, the power of their supporters - normally loan players come and they get what they need out the loan and they go.
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"I think this club is so much more than that, so I think we're a brilliant club for loan players, but the way he's bought into everything and connected with the supporters, with teammates."
Caldwell added: "He turned up at half five at a gym at Newton Abbot and he was the first one there, after cancelling his holiday.
"I think that tells you everything you need to know about Vil, and I'm sure he'll go on to have an incredible career."