Blackburn boss Sam Allardyce has kept himself away from his players because of illness, as the club attempts to contain an outbreak of swine flu.
Allardyce sat in the stands during Tuesday's 5-2 win over Peterborough and did not do post-match media interviews.
"He is feeling a little unwell, so he sat upstairs and shot out (after the game) so nobody gets what he may have," said assistant boss Neil McDonald.
Three players at the club have been recovering from the swine flu virus.
There are thought to be five cases at the club in total and reports had suggested Rovers would seek to postpone Tuesday's tie at Ewood Park, but the game went ahead.
Midfielder David Dunn and defender Chris Samba were two of the Blackburn players reported to have a virus and both of them were missing from the squad for the 5-0 defeat at Chelsea on Saturday, though Dunn did come on as a late substitute against Posh.
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