Indeed, Marsh feels Shelvey can hit double figures this season.
Marsh told Liverpoolfc.com: "I would say so, yes. He's started the season really well, got himself on the scoresheet and made himself a player of note with getting in and around the goal. He's done really well and has been rewarded for it.
"Jonjo is still only 20, but he's shown a lot of ability and potential. If he fulfils it, he'll go on to be an international player for many years to come.
"He is a goal threat. He wants to score a goal - he's not happy just to sit there and let the play go on around him. When play develops, he likes to get into the box and he's not afraid to shoot. He's been a real plus for us this season.
"I would say he can reach doubles figures this season. He's an advanced midfielder on three goals already, and we're only just into October.
"If he doesn't get 10 goals this season I think he'll probably feel disappointed."