For the winner of that tie will face Norwich City Reserves in the quarter-finals if the Canaries beat Fakenham.
The Anglian Combination outfit's manager Riki Chase said: 'There is the incentive of Carrow Road for both teams, but more for us being the lower- placed team. A few of the boys have been talking about it – it will spur them on. We are under no illusions – [United] are two leagues above us but we hope to give them a game and cause an upset.'
The Angels will have a full squad and are keeping their fingers crossed the tie will actually take place on Saturday. kick-off 3pm.
'It has been called off four times already. It's an ongoing saga at the moment in Norfolk,' said Chase.
Walsham are just below half-way down the Premier table with a much-changed squad this season after nine players left.
'We have got more local and younger boys. We are predominately a local-based team which is unusual in this league. We know we can beat most teams in our league, we just need to get more consistency,' added Chase.
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