The Colombian midfielder has been one of the stars of Portuguese football since his 2013 arrival from Italian side Pescara, with is performances leading to links with a host of Europe’s biggest sides.
Porto – who have a reputation for selling talented South American players for massive fees – have since slapped a £32m valuation – his release clause – on the 21-year-old, but that has not put off Saints boss Ronald Koeman.
The Dutch boss has made an excellent start to life at Southampton, with some notable performances meaning that the South Coast club are firmly in the battle for Champions League qualification with the campaign now past the halfway point.
Koeman has already signed winger Eljero Elia on loan, but he wants to add more attacking talent with Quintero.
Although a £32m outlay would be a shock for the St Mary’s club, funds are in place following the sales of a number of big money players over the summer, including Adam Lallana, Dejan Lovren and Luke Shaw for a combined figure of over £60m.