Colchester striker Jamie Guy has rejoined Conference side Cambridge United on work experience.
The 18-year-old front man had already spent a month at the Abbey Stadium earlier this year, scoring once in four Conference appearances.
Since then, he was recalled by Colchester and has made two appearances in their LDV Vans Trophy campaign.
However, he is now free to go out on loan again after Colchester signed three forwards in the last week.
Ipswich's Billy Clarke, Rotherham's Jamal Campbell-Ryce and Blackpool's Scott Vernon have all recently moved to Layer Road on loan.