Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Juan Martin Hernandez believes Ireland's quarter-final prospects hinge on getting Johnny Sexton, his old Racing Metro club-mate, patched up and ready for Sunday. The veteran who goes by the nickname of El Mago (The Magician), Hernandez is best known in these parts for putting a stake through Irish hearts at the 2007 World Cup with a hat-trick of morale-sapping drop goals. Out-half may no longer be his stage where he stylishly struts his stuff, as he has played centre in nine of his last dozen outings following a season-long stint at full-back, but he touts Sexton as the danger to silenced in order for the Pumas to roar.Johnny Sexton could be risked for Ireland's Rugby World Cup quarter-finalThe Leinster fly-half injured an adductor muscle but is close to full fitnessJuan Martin Hernandez believes Sexton sets Ireland's tempo on the pitchRugby World Cup 2015: See the latest RWC news, results and highlights 
 Question:He had some monumental on-pitch battles with O'Gara, but working at the same club for a year transformed _'s impression of his former enemy.

Juan Martin Hernandez