Alonso was third in the World Championship as recently as last month’s Italian GP, but after a run of frustrating weekends, he now lies fifth, with Charles Leclerc, Lando Norris and George Russell all reeling him in.
Aston Martin meanwhile has fallen to fifth place in the constructors’ championship but is under no threat from behind after being bettered by McLaren.
Alonso had another disappointing weekend in Mexico, starting 13th and then falling back after suffering suspected floor damage from debris left by Sergio Perez's first corner accident. Aston eventually decided to retire the car.
His team-mate Lance Stroll started from the pitlane following a spec change, and was let through by the struggling Alonso before retiring after a late collision with Valtteri Bottas.
The Spaniard accepts that his slide down the championship table will continue.
"Honestly, we are not fighting for anything,” he said when asked by Autosport about the next race in Brazil.
"We will learn, even if we have to start from the pitlane, and you know that is more useful than just spending the weekend.
Source: Autosport