McLaren has a very limited number of choices. There are only about 40 drivers who are qualified for superlicences in 2017 and most of them are not at all suitable for F1. Twenty-one of them are F1 drivers (if one includes Pascal Wehrlein and Antonio Giovinazzi). There are some test drivers, such as Sergey Sirotkin and Pierre Gasly and McLaren’s Young Driver Nyck de Vries, but he does not seem to be a likely choice at the moment. There are some Formula E drivers and a string of sports car stars, plus the retired Mark Webber.
There are six Indycar drivers on the list: four Penske drivers: Will Power, Simon Pagenaud, Helio Castroneves and Juan Pablo Montoya. Chip Ganassi’s Scott Dixon. He’s a Honda driver, but it is unlikely that Ganassi would let him wander off, as he is after a third Indy 500 win. That leaves Rossi.
It is fairly likely that whoever drives the McLaren at Monaco will appear in a McLaren next week in the Bahrain test…