'What is important is that everyone is available to play and the team is not affected by the names.
Speaking to Sky Sports, Gunners legend Merson said: "I don't see how Swansea win this game - their priority is staying in the Premier League".
Spurs manager Mauricio Pochettino, yet to mark his impressive work at the club with a trophy, said: "We're in the semi-finals, Wembley is waiting, we deserve it".
But Tottenham were unruffled and quickly settled into a tempo that had the home side outnumbered and second best in midfield.
The visitors, who were without Harry Kane, broke the deadlock on 11 minutes courtesy of a sublime strike from Christian Eriksen that sailed into the top corner.More news: NCAA Tournament West Virginia Mountaineers vs Murray State Racers Start Time, Odds
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The visitors thought they had a second from Heung-min Son but the goal was ruled out after a lengthy VAR ruling.
Eriksen was wreaking havoc in the Swansea defence and he was unlucky not to make it two when his shot from the edge of the box was finger tipped on to the bar by Nordfeldt.
There are few bigger compliments to give Spurs than to say they did not miss the England striker - who has scored 53 goals in his last 53 matches - and they should have been out of sight before half-time.
Tottenham took control after Eriksen's brilliant curled effort and, with Swansea so passive and the Dane seemingly at the centre of everything, Spurs enjoyed an extraordinary amount of possession. Carvalhal made a positive change, replacing Kyle Naughton with Luciano Narsingh, knowing his side had to go for broke.
Swansea had an early shout for a penalty turned away when Nathan Dyer was sent racing clear by a Tammy Abraham pass. Alfie Mawson scooped the ball away with a quick interception.
But Spurs made them pay the price when Eriksen fired home a decisive third after Moura's run just past the hour.
The hard-working Lucas Moura played the ball back to Eriksen, who claimed a deserved second goal with a low shot from the edge of the box that had sufficient power to go through Nordfeldt's hands.