By Felix Keith Erik ten Hag should be worried because Sir Jim Ratcliffe will not hesitate to sack him in the summer, according to Rio Ferdinand. Ten Hag is under pressure once more after his side were turned over 2-1 by Fulham at Old Trafford on Saturday. The defeat brought to an end a four-game winning streak in the Premier League and raised further concerns about United’s progress under the Dutchman. United are sixth – eight points adrift of Aston Villa in fourth – and must avoid defeat in the FA Cup fifth round against Nottingham Forest on Wednesday night. The arrival of Ratcliffe and his I…