"The move is in everyone's interest. It is not a transfer and nothing has been discussed beyond the three-month period," Chairman Steve Lansdown told the official website.
"It will enable Marcus to play regular first team football at a time when he is not first choice here.
"That means he will have the chance to show what he can do to Yeovil, ourselves and any other club who might be interested.
"Wherever his future lies, it has to be good that he can League football each week - apart from when we play Yeovil."