Manchester United are interested in signing Bayern Munich midfielder Bastian Schweinsteiger and Real Madrid defender Sergio Ramos.
United boss Louis van Gaal is trying to strengthen his squad after they finished fourth in the Premier League.
Germany international Schweinsteiger, 30, and 29-year-old Spain player Ramos are among those who interest him.
Ramos’ contract with Real expires in 2017, while Schweinsteiger’s Bayern deal runs until 2016.
Van Gaal is particularly keen to recruit a right-back, central defender, central midfielder and striker.
United, who have already bought PSV Eindhoven winger Memphis Depay for £31m, are also interested in Tottenham forward Harry Kane.
Barcelona full-back Dani Alves also interested them, but he has signed a new deal at the Nou Camp.