text: The 21-year-old, who has also played on the wing, has progressed through Wigan's youth system.
  Tierney is the son of former England dual-code international Jason Robinson, who also played for the Warriors.
  "It is a huge achievement for me to agree this contract extension and I'm very happy to be staying at my hometown club," said Tierney.
  His new deal also includes the option of a further year.
  "Lewis is a good young Wigan kid who knows what it means to play for this great club," added head coach Shaun Wane.
  "He has improved a greatly in the last few years and it excites me that there is still a lot more improvement to come."
target: Wigan Warriors full-back Lewis Tierney has signed a new three-year deal with the Super League side until 2019.