Nico Hulkenberg has expressed his 'surprise' at the news Fernando Alonso will miss the Monaco Grand Prix to race at the Indianapolis 500 and has shot down comparisons to his dual commitments between F1 and the Le Mans 24 Hours in 2015.

Alonso rocked the motorsport world with his shock announcement to miss the Monaco F1 race in order to make a rookie appearance at IndyCar's Indianapolis 500 which are run on the same weekend.

Despite splitting his commitments between F1 and WEC for a chunk of the 2015 season - which saw him go on to win the Le Mans 24 Hours with Porsche - Hulkeneberg says he would never miss an F1 race if Le Mans had clashed.

"My case was completely different, I didn't go away from F1 in the way he is," Hulkenberg said. "I would have never done it if I had to miss a race for it, especially Monaco.

"A big decision and big news obviously and he can do what he wants. I am a bit surprised like everybody about this situation."

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Hulkenberg also predicts Alonso will have a tough time adapting to a new championship due to the different cars, tyres and oval racing - all of which will be brand new to the two-time F1 world champion. The German driver played down comparisons to his stint with Porsche as he had a lengthy testing programme to adapt to the different challenges.

"I think it is quite tough," he said. "I don't know much about Indy but he has never driven these cars or an oval, so do you think you can come in and win that easily? I at least had half a year practice [for Le Mans].

"It sounds like a challenge but obviously Fernando likes challenges."

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