Luke Williams says the ball is in Ben Cabango's court after Swansea City staff made a presentation to the defender in a bid to convince him to sign a new contract.
Wales centre-back Cabango sees his current deal expire at the end of the season.
Swansea accept that there is bound to be rival interest in Cabango, but hope the 24-year-old will recommit to the club where he has made 202 senior appearances since coming through the academy ranks.
Head coach Williams, chairman Andy Coleman and captain Matt Grimes were among those involved in the meeting with Cabango and his representatives, along with others including Swansea's kit men and chef, who are all supporters of the club.
"We had a very good presentation and meeting with Ben Cabango. We gave everything that we could to that, so we need to see if it was enough," Williams said.
"Many people from the club side [were involved], from the kit men to the chef to the chairman and the captain.
"So many people were in there because we feel like we need to show him exactly how we feel, rather than him think 'OK they have left it until the last minute and maybe they don't feel like there's anyone else, so they are just offering me [a contract] now'.
"I think after this presentation, he can't feel like that."
Cabango has been one of Swansea's standout performers this season, playing every minute of their Championship campaign having developed a formidable central defensive pairing with Harry Darling, who is also out of contract next summer.
Swansea have scheduled a similar meeting with Darling, 25, as they attempt to persuade him to sign a new deal.
In Cabango's case, Williams says Swansea must stay patient as he has "plenty of things to consider".
Officially, the Cardiff-born player is not allowed to talk to other clubs in the English system while he is at Swansea, though he will be free to speak to overseas teams should his contract situation remain unchanged come 1 January.
Williams says Cabango's representatives are already likely to be aware of interest from other clubs because of the uncertainty over his Swansea future.
"We have to understand from Ben's point of view that in a period of time when not much is happening [with his contract], the agent's job is to protect his client and try to give him the best options," Williams said.
"We have to appreciate that things were done quite late and potentially the wheels were in motion elsewhere.
"Ultimately it comes down to what Ben wants to do and what he feels is best for him and his family."
Williams, whose side go to Luton Town in the Championship on Saturday, says there is no deadline for Cabango to respond to Swansea's offer.
"If he doesn't speak to us and the [January] window closes, at least we know we have him until the summer," he added.
"I think it's fair of me to suggest that the ball is in his court and he is in charge."