Carlos Sainz has said that he is sure Fernando Alonso will "represent" current Formula 1 drivers well at the Indy 500 on Sunday.

While Alonso's usual competitors are contesting the prestigious Monaco Grand Prix this weekend, the Spaniard will be in Indianapolis preparing for the famous high-speed oval race.

Sainz, a Spaniard and friend of Alonso's, said that he will be keeping his eye on Alonso's exploits.

"I watched qualifying and was not surprised how well he did. I knew he would," the 22-year-old told Spanish daily Marca.

"The race is another story, very long and with so much that can happen, but I'm sure he will also do well.

"I'm sure all of us Formula 1 drivers in Monaco will be watching and encouraging him, hoping he does well and that he represents us well."

Jenson Button will stand in for McLaren in Alonso's absence.