Global Motorsport Media
"Right now, you have to recognise the fantastic job that they are doing," the Spaniard told the German weekly Sport Bild.
Alonso, whose current teammate is Felipe Massa, also said German Vettel is welcome at Ferrari.
I am happy to have Massa as my teammate but, one day, who knows
"I am happy to have Massa as my teammate but, one day, who knows."
Alonso said the 24-year-old Vettel is sure to win the 2011 title unless he has "an extraordinary series of bad luck".
"If I was to bet my money it would be on him," he added. "He is a great champion in the process of winning his second championship, (he is) hugely talented and able to perform well under pressure."