Brentford will have to assess Mathias Jensen ahead of their Sky Bet Championship clash with Bristol City on Wednesday.
The midfielder was forced off in the 85th minute of Saturday’s 3-1 win at Barnsley and could miss out against the Robins.
Danish defenders Mads Bech Sorensen and Luka Racic remain sidelined through injury.
Greek striker Nikolaos Karelis is pushing for a first start after coming off the bench in the last two matches.
Bristol City will be without Adam Nagy for their trip to Griffin Park.
Manager Lee Johnson hopes the Hungarian midfielder will be able to come off the bench in the Reading game ahead of the international break.
Tomas Kalas will be unavailable, but Johnson hopes the centre-back could return soon as he continues to make progress following a muscle injury.
The boss indicated Kalas could be training fully again imminently and be ready for the Luton match on October 19.