Manchester United are looking to make two more signings this summer, with Luka Modric, Joao Moutinho, and James Rodriguez all targets.
Modric is believed to be Sir Alex Ferguson's top transfer target, but with Tottenham holding out for £40million for their Croatian playmaker, the Red Devils are considering other targets.
United have been showing interest in Porto winger Rodriguez for some time, and reports in Portugal last month suggested the club were preparing to launch a £30million bid for him.
His Porto team-mate Moutinho, who like Modric is a target for Chelsea, is also believed to be on Ferguson's radar.
And speaking to MUTV, the Scot, who has already signed Shinji Kagawa from Borussia Dortmund and teenager Nick Powell from Crewe, said: "We're working on one or two things but there's nothing really to tell you to be honest.
"We always try to get our work done at the end of the season – we spent a good deal of time sorting the deal with Shinji and we'd agreed a deal with Nick Powell before the play-offs which was a good move by us because the boy had an outstanding final at Wembley.
"When you don't get deals done immediately and you're negotiating with a club over a long period, then you can't expect to just snap your fingers and get it done."
Last month it had been reported in Portugal that United were considering offering midfielder Anderson to Porto as part of a deal for Rodriguez.
His agent, Silvio Sandri, recently refused to rule out a summer move and confirmed he was looking to hold talks with Porto in the near future to discuss his client's future.
"There is nothing new to report. This is a matter to be discussed with Porto," Sandri told O JOGO.
"Within a couple of weeks I plan to go to Portugal to speak with the leaders of Porto.
"I cannot talk more about this as it is so complex."