Why has Iraola only signed a two-year contact at Liverpool?

[BBC]Former Bournemouth manger Andoni Iraola has agreed a two-year deal as Liverpool head coach.The contract goes against the recent trend of lengthy terms agreed in the Premier League, such as former Chelsea manager Liam Rosenior initially signing up for six-and-a-half years at the London side - before departing after three months in charge.So why has the Spaniard agreed to a relatively short contract?Speaking to BBC Radio Solent last year, Iraola said his personal preference is for short-term