Manchester United boss David Moyes visited Lisbon on Wednesday night to personally run the rule over at least three top transfer targets.
The Scot - who will be handed up to £200m to revamp his beleaguered squad, providing he manages to keep his job, this summer - attended the Portuguese Cup semi-final between Porto and Benfica at the Estadio da Luz.
According to the Daily Mail, Moyes was there specifically to watch Porto's French centre-back Eliaquim Mangala, who has been strongly linked with a move to Manchester City, and his teammate Jackson Martinez, the Colombian striker linked with the likes of Borussia Dortmund, Juventus and Arsenal in recent months.
However, the United boss was also in the Portuguese capital to monitor Benfica left-back Guilherme Siqueira, who is currently on loan from La Liga outfit Granada.
There's a growing belief at Old Trafford that the Red Devils will beat Chelsea to the signature of Southampton's teenage full-back Luke Shaw, but Moyes is believed to be keeping an eye on Siqueira as a contingency plan.
To complete the signings of Mangala and Martinez this summer, Moyes would need to spend in the vicinity of £70m.
Mangala has a £37.8m release clause, which Moyes is reluctant to trigger, while Porto value in-demand striker Martinez in the region of €40m.
Moyes is keen to wrap up deals before the start of this summer's World Cup finals, and has reportedly already stuck a £35m deal with Sporting Lisbon for the transfer of highly-rated midfield enforcer William Carvalho.
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