Gianfranco Zola says he has broken his phone in a bid to make sure Matej Vydra remains at Watford.
Vydra's form since his arrival in the summer has attracted the attention of five Premier League sides and the striker's parent club Udinese have rejected a bid from one of those teams, according to his agent.
The Czech Republic international's representative Ondrej Chovanec denied rumours Roma had expressed an interest in his client but didn't rule out a switch to the Italian club.
Chovanec had last week said it was "very likely" Vydra would be signing permanently for Watford and Zola was confident the move would happen when he was asked at the weekend.
"I have broken my phone so they can try phoning me but they won’t find me that is for sure," Zola joked.
"I have no doubt in my mind [he will stay]. I have had no indication that he is leaving and I think the club want to keep him and the player I believe wants to stay so we should be alright."
The Italian continued: "As far as I understand it, the player wants to stay here as well because we can help him keep improving.
"I don’t think Matej believes he has already got to the top and he knows there are still margins to improve and that is what we are going to be working with him on.
"I think he can give Watford the edge because there will be many teams looking for him."
"Here he can have the attention he needs and maybe next year he will be playing for us in the Premier League," Zola added.
Vydra, who Zola described as "a good boy who works very hard", has scored ten goals in his last five starts.
The 20-year-old is on a season-long loan from Udinese and Watford are confident of securing his services permanently - although the Championship club will not be in a rush to tie him down before the transfer window closes.
The striker has scored 18 goals in 25 league appearances this season, nine of which were from the substitute bench.
On the interest from Roma, Vydra's agent told Gazzetta Giallorossa: "No, honestly I never talked to any of the leaders at Roma. For the moment there are no offers from the Giallorossi."
"Everything is possible. For the moment there is only one offer from a Premier League club but it was rejected by Udinese," Chovanec added.
"The player of course liked the interest of Roma. We like their style of work, their play, we like (Zdenek) Zeman. If the offer is right, never say never."