You will be given a definition of a task first, then some input of the task.
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].

With Branislav Ivanovic out injured, Jose Mourinho is forced to look for an alternative at right back against Aston Villa. But one name mentioned by the Chelsea boss is a relative unknown: Ola Aina. While Cesar Azpilicueta, Kurt Zouma and Ramires were all touted as options for Saturday's game by Mourinho, it was the name of the academy product who turned 19 last week that drew the most interest for many spectators. Here, Sportsmail takes you through who the young right back is and why Mourinho rates him highly. Now aged 19, Temitayo Olufisayo Olaoluwa Aina has been at Chelsea since he was 11, progressing through the club's youth sides while working his way up the ranks with England, too.Chelsea manager Jose Mourinho says he has four options for a right backFirst-choice Branislav Ivanovic is out after picking up a hamstring injuryCesar Azpilicueta, Kurt Zouma, Ramires or Ola Aina could deputiseAina is a two-time FA Youth Cup winner who impressed Mourinho on tourTony Pulis: Chelsea boss Jose Mourinho's £50,000 fine is 'extraordinary' 
 Question:A pacey option at right back, _ can also play in the centre of defence, on the left, or in a more advanced position on the right wing.
Output:
Ola Aina