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London Broncos are back at Priestfield this weekend for Super League action.
And Gills chairman Paul Scally is keen for the Broncos to make a decision soon whether they want to make the move permanent.
Broncos are without a home ground next season and moving to Gillingham is one option.
But Mr Scally, who will be in the stands to watch them face Warrington Wolves tomorrow (Saturday), wants a decision either way soon.
He said: “They need to make a decision about what they are doing.
“I told them that I want to know by the end of the month.
“I am not even convinced it is right for us anyway and so I am not going to spend any time considering it until I find out if they are definitely wishing to come."
The Super League game kicks-off at Priestfield at 3pm.