The Fiorentina players celebrate Mario Gomez's opener
The Egyptian pounced on Jan Vertonghen's lapse defending to put the tie beyond doubt after Mario Gomez had opened the scoring.
It was Salah's third goal since moving from Chelsea on deadline day as part of Juan Cuadrado's £26.8million switch to Stamford Bridge.
Gomez broke free midway through the second half to bury his one-on-one effort under Hugo Lloris, who was then stranded for Salah's strike as Vertonghen dithered on a clearance.
Chelsea v Tottenham - League Cup Final Preview
Roberto Soldado squandered Spurs' best chance to grab that elusive away goal when he bore down on Norberto Neto but fluffed his sidewards pass to Nacer Chadli right into the goalkeeper's grateful hands.
Not even Harry Kane's introduction late on could save Spurs, who must now prepare for a Wembley showdown with Chelsea less than 72 hours after landing back in London in the early hours of tomorrow morning.
EPA
Mohamed Salah bagged Fiorentina's second against Spurs
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