The midfielder who joined in the summer has found game time minimal at the Liberty Stadium and it is reported by Sky Sports that he will make the switch to the League Two side until the end of the season.
The report on SkySports.com reads
The 22-year-old only moved to the Liberty Stadium from Aldershot over the summer but he has not yet been able to establish himself as a regular starter.
He does not appear to figure in the immediate plans of manager Brendan Rodgers and is thought to be heading to Adams Park on a temporary basis.
A deal keeping Donnelly at Wycombe until the end of the season is expected to be confirmed, allowing the youngster to get a large number of games under his belt.
The arrival of Donnelly will also boost the Chairboys in their fight for promotion from League Two.