The Ecuador international was forced off during the 66th minute of the Red Devils' 2-1 win over West Bromwich Albion at The Hawthorns on Sunday afternoon.
United's medical department have yet to comment, but Valencia appears confident that he has avoided any sort of serious injury.
3 points at a hard stadium. Thanks for your support and concern. I am fine and our @manchesterunited won! ⚽️💪🏽 3 puntos en un estadio difícil. Gracias a todos por su apoyo y preocupacion. Estoy bien y nuestro equipo ganó! Vamos @manchesterunited
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"3 points at a hard stadium. Thanks for your support and concern. I am fine and our @manchesterunited won!," he wrote on his personal Instagram page.
Valencia has made 24 appearances for United this season, seven of which have come in the last 23 days.