Centre-back Davies, 34, has signed an 18-month deal after his contract at Hartlepool United was terminated, while Dieng, 24, has signed on loan.

Davies - who captained County under McIntyre - has made 13 appearances this season in England's fifth tier.

"I am sorry that I could not achieve what I had set out to," Davies said.

Dieng - whose move remains subject to international clearance - was born in Switzerland of Senegalese descent and played 16 times in England's League Two for Stevenage earlier this season.

He has previously had spells with Grasshoppers and MSV Duisburg before joining QPR in 2016.

As Davies arrives at Dens Park, 22-year-old midfielder Lewis Spence became the fifth player to exit the squad McIntyre inherited from Neil McCann in October.

Spence, who joined Dundee from Dunfermline Athletic in June 2017 and made 16 appearances this season, has joined Championship leaders Ross County.

Left-back Calvin Miller has returned to parent club Celtic, while defender Andy Boyle has gone back to Preston North End.

Midfielder Nabi left to join OFI Crete, while striker Marcus Haber was released at the end of his loan to Championship side Falkirk.

McIntyre has also told striker Sofien Moussa and midfielders Elton Ngwatala and Kharl Madianga they can find new clubs.

Meanwhile, Finland midfielder Glen Kamara has signed a pre-contract agreement to join Rangers at the end of the season.

Dundee have added one other player to their squad, former County forward Craig Curran arriving from city rivals Dundee United.