Manchester United have reignited interest in signing Tottenham Hotspur target Bruno Martins-Indi from Porto, according to reports from the , but failed to secure his services ahead of his move to join Porto from Feyenoord.
It is believed that United have already arranged their second scouting mission to watch the displays of the defender in the space of less than a month.
They watched him in the 2-1 win over Chelsea late last month and were also present at the weekend when his side drew 0-0 with Braga in the domestic league.
Van Gaal is said to be looking to reinforce his defensive options during the January window given the long-term injury to left-back Luke Shaw and 
Apart from playing on the side of defence, Martins-Indi is also able to be deployed down the middle, playing as a left-back on two occasions and a centre-back another four times so far this term.