Dasilva, 22, who is capped at youth level for both England and Wales, started his career with Luton Town before making the move to Chelsea, staying at Stamford Bridge for six years in their academy system.
He then moved across the capital to Brentford before signing for Croatian Premier League side HNK Sibennik last year.
Upon his arrival at the Velocity Stadium, Dasilva said; “I’m buzzing to be here!”
“I’ve seen how the boys play and I’ve been impressed. The standards are very high and the quality and intensity is too.
“Ross (Jenkins) explained how things are here and promotion is the aim. It’s a very exciting time so hopefully we can carry on how we are doing now.”
Welcome to Oxford City Cole!