The keeper signed for Manchester United back in 2011 and was designated to replace retiring goalkeeper, Edwin van der Sar.
But he said the United supporters could have raised his players' morale agaisnt Swansea.
The England worldwide is coming to the end of a frustrating season, having made only 20 appearances after having fallen out of Jose Mourinho's plans.
Mourinho has endured a hard first season in charge of the 20-time English champions following his appointment as Louis van Gaal's successor at the end of the 2015-16 season.
Another avenue to the Champions League is through the Europa League in which Celta Vigo stand in the way of the final.
Ivory Coast defender Eric Bailly was also injured against the Swans, his twisted ankle leaving Mourinho even shorter of centre-back options.
They face Celta Vigo in Spain in the first-leg of their semi-final on Thursday.
He said: "I prefer not to speak about Jones & Smalling".
Speaking after the match, Mourinho not-so-subtly questioned Shaw's substitution by saying that he was expecting a big injury as he could see no other reason for Shaw to ask for a substitution after only 7 minutes.
The Sun claimed last month that the United misfit is "desperate" for a reunion with Spurs boss Mauricio Pochettino, who managed him during his Southampton days.
It may look like a tough call to take all three points against a Man United team that is unbeaten in 25 League fixtures, but as we know with Arsenal, anything is possible. The context is nine matches in April, 810 mins of football, high levels of fatigue, big match after big match after big match. "We are very exhausted so I don't take the performance out of context". 'We have a squad of 22 that is reduced to 13 or 14 players.
"We lost players and we lost points, so yes today was a bad day", said Mourinho, whose side ended the weekend just outside the Champions League places in fifth spot, a point and a position below Manchester City.