Captain Stephen Dawson starts for Orient after recovering from a dead leg.
Scott McGleish and Alex Revell lead the line up front at the Liberty Stadium.
Boss Russell Slade fields his strongest team possible for the round four clash, as the O’s look to progress further in the FA Cup than they have for almost 30 years.
Defender Elliot Omozusi is back from hamstring trouble but Andy Whing starts ahead of him at right-back.
Adam Chambers also makes the bench after his lay-off.
Boss Russell Slade puts latest Spurs loan signing, midfielder Tom Carroll, on the bench along with fellow prospects from White Hart Lane, Paul Jose Mpoku and Harry Kane.
For hosts Swansea, Andrea Orlandi beats an injury scare and is in the starting line-up.
Jones (gk), Whing, Chorley, Forbes, Cox, Dawson (capt), McGleish, Revell, Daniels, Spring, Smith.
Subs: Omozusi, Chambers, Butcher (GK), Téhoué, Carroll, Mpoku, Kane
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