Brentford boss Thomas Frank admits Mathias Jensen faces longer out.
The Denmark midfielder's knock picked up last week is taking longer to heal than expected.
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Frank confirmed: "Mathias Jensen is unfortunately a few weeks from being ready, so it is a small blow for us - he is an important player for us.
"Fortunately, other players have stepped up for us, as Yehor Yarmoliuk did against Newcastle."
Chelsea host the Bees tomorrow.