Talisca and Salvio both play for Benfica and have previously been linked with Chelsea and Liverpool respectively.
And Silva - who has been compared to Eden Hazard - has been linked with Manchester United and Liverpool after impressing this season at Braga.
Silva has a £17.7million release clause in his contract and Spurs are hopeful that he can be signed for substantially less than that, according to the Evening Standard.
Salvio's release clause currently stands at a prohibitive £40million, but the Argentine ace is in the process of negotiating a new deal that could see that figure fall.
GETTY
Eduardo Salvio has been linked with Liverpool
Talisca is one of two players we've been scouting since 2012.
Jose Mourinho
Talisca, meanwhile, is one of the hottest properties on the transfer market and Jose Mourinho has admitted being keen on the Brazilian.
In September, Mourinho said: "Some say he's unknown. He's so unknown the only thing stopping him from playing in England is work permit.
"Good English clubs wanted him, and they even wanted to sign him and loan him out so he could get a work permit later."
Mourinho later added: "Talisca is one of two players we've been scouting since 2012."
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