Arsenal striker Tyreece John-Jules and West Ham midfielder Conor Coventry have joined Lincoln City on-loan.
Lincoln have signed defender Max Melbourne and midfielder Tayo Edun on permanent deals and brought in John-Jules and Coventry on loan.
Melbourne, 21, has had a loan deal with the Imps from West Brom turned into a two-and-a-half-year contract.
Edun, 21, arrives from Championship side Fulham on a similar deal.
Arsenal forward John-Jules, 18, and 19-year-old West Ham midfielder Coventry move to Sincil Bank on deals until the end of the season.
Neither England Under-19 international John-Jules, nor Republic of Ireland Under-21 international Coventry have featured in the Premier League for their parent club, but both have played in cup competitions this season.