By Frank Dalleres West Ham are expected to complete a double swoop for Germany striker Niclas Fullkrug and Argentina midfielder Guido Rodriguez early this week. The Hammers have agreed a £27m fee with Borussia Dortmund for Fullkrug, 31, and have emerged as the preferred destination for free agent Rodriguez, 30. Both players were due to fly to England at the weekend to undergo medical tests and sign their contracts with West Ham. The deals follow the club’s signing of Dutch youngster Crysencio Summerville from Leeds United for £25m on Saturday. He became their third major signing of the summer,…