By Sean Walsh & Graeme Bailey Tottenham Hotspur are believed to be ‘fairly confident’ of agreeing a deal with Sporting CP for wing-back Pedro Porro before the end of the January transfer window. Spurs have been locked in talks with the Portuguese side for a number of weeks over a deal for the highly-rated Spaniard. Sporting boss Ruben Amorim has consistently stressed that Porro will not be sold unless his €45m release clause is met up front. However, 90min understands some members of their hierarchy are tempted to accept an offer in instalments. Talks are also ongoing with Roma regarding a pot…