Oxford have signed West Ham forward Christian Montano on a one-month loan deal.
The 20-year-old Colombian has already enjoyed loan spells at Swindon, Dagenham and Notts County this season and goes straight into the weekend's squad to face Rotherham at the Kassam Stadium.
He told the club's official website: "I'm very excited to be here. I spoke to Robbie Hall who was here earlier this season and he told me all about the club.
"He said the team, the coaches and the set up were first class and that the fans were great so I am really looking forward to it.
"I've been very impressed on my first day and hope to be involved in some way tomorrow and take it from there."