Officers have released an image of a man they want to speak to.
The incident happened inside a shop in Main Street at around 7 pm on Friday 3rd September.
A 30-year-old woman, who worked in the shop, was punched in the stomach.
PC Hollie Woods, said: “I’d like to speak to the man pictured as I believe he may have information about this incident.
“If you recognise him – or indeed you are that person – then please get in touch.”
You can pass on any information via the Leicestershire Police website.

Did you witness the three-vehicle collision on M1 in Leicester this morning?
Leicestershire councils could look like this in the future
Appeal for missing teen last seen a week ago
Man missing from Barwell- Found
Police investigating ATM theft in Markfield
Leicestershire groups receive King’s Award for Voluntary Service
People urged to get their covid jab in the next two weeks ahead of restrictions lifting in England
How to get your Covid vaccine if you're over 18