Manchester United are believed to be plotting a move for Porto defender Jose Bosingwa.
United boss Sir Alex Ferguson is thought to be drawing up a list of targets as he continues his search for a long-term replacement for Gary Neville.
With doubts surrounding Neville's fitness and Wes Brown set to leave at the end of the season after rejecting a new deal, Ferguson is keeping tabs on Bosingwa's progress.
United have showed a liking for the Portuguese transfer market after bringing in Cristiano Ronaldo, Nani and Anderson in recent years and Bosingwa could be the next target.
Old Trafford assistant manager Carlos Queiroz has confirmed Bosingwa is one of a number of Porto players they are tracking.
"There are some Porto players good enough to play for United if they want to Jose is one of them," Queiroz is quoted as saying in the Daily Mail.
"He is a very good player and we are keeping an eye on him."
Aston Villa are also thought to be keen on Bosingwa as Martin O'Neill looks to bolster his defensive options.