SANTIAGO, June 4 (Reuters) - Striker Alexis Sanchez scored

two first-half goals before suffering a knee injury in Chile's

2-0 friendly international win over Guatemala on Wednesday

Sanchez went off at halftime and his replacement Humberto

Suazo added to coach Marcelo Bielsa's worries when he limped

off with an ankle injury less than half an hour later.

It was not immediately clear how serious the injuries were.

Bielsa is already under pressure after omitting a number of

European-based players, including midfielder Arturo Vidal and

striker Luis Jimenez, as well as Brazilian-based playmaker

Jorge Valdivia.

Both teams were warming up for World Cup qualifiers.

Chile are away to Bolivia and Venezuela in the South

American group later this month while Guatemala, who have never

reached the finals, face St Vincent and the Grenadines over two

legs in a CONCACAF region second preliminary round tie.

Sanchez, 20, opened the scoring in the second minute from a

Carlos Villanueva free kick and the same combination produced

Chile's second after 35 minutes.

Chile goalkeeper Claudio Bravo was little more than a

spectator as Guatemala completed their third successive game

without scoring.