The 26-year-old winger put Swansea ahead with a 12th-minute lob, but after he was carried off later in the first half, Gary Hooper struck with a glorious volley to earn the home side a share of the points.

Swansea later tweeted that Dyer will undergo more tests on Monday.

"Initial x-ray shows no obvious break to Dyer's ankle. However, he will have further scans tomorrow before final diagnosis," said the Welsh side.

The draw meant that Swansea remained in 10th place, while Norwich, who would have leapfrogged their opponents with victory, climbed one position to 14th.

Norwich were unchanged from the team that won 2-0 at West Bromwich Albion last weekend, while Swansea manager Michael Laudrup made eight changes to the team that had lost to St Gallen in the Europa League on Thursday.

Michu was among the players who came into the visitors' starting XI, in place of Wilfried Bony, and after Pablo Hernandez had shot wide in the early stages, Swansea took the lead.

Dyer belied his diminutive stature by beating Sebastien Bassong to a high ball from Swansea skipper Ashley Williams and then beat exposed Norwich goalkeeper John Ruddy with a measured lob.

Michu could have made it 2-0 when he fired over from a Ben Davies cut-back, but Norwich showed notice of their intent when Hooper picked Williams's pocket, only to shoot off-target.

There followed the injury to Dyer that seemed to rob Swansea of their momentum, with the winger stretchered off and given oxygen after his ankle buckled in a duel with Bassong.

Norwich were quick to exploit the visitors' vulnerability, with Williams heading a shot off the line before Hooper equalised in the fourth minute of first-half stoppage time.

Johan Elmander brought down a long ball from Steven Whittaker and teed up the former Celtic striker, who sent a glorious 25-yard volley dipping beneath the crossbar to register his fourth goal in six league games.

Norwich sought to press home their advantage in the second period, with Bassong heading wide from a corner and Whittaker grazing the post with a low drive.

Alejandro Pozuelo, Dyer's replacement, shot high after a one-two with Hernandez, but Norwich soon resumed their assault and saw centre-back Michael Turner hit the bar with a header from a corner.

Swansea goalkeeper Michel Vorm saved smartly from Hooper and Nathan Redmond shot narrowly wide, but the visitors survived and might even have snatched victory at the death.

Bony, on as a substitute, went close with a curler, before Jonjo Shelvey drew a fine save from Ruddy.