The Irishman was brilliant in the 2-0 triumph at Dens Park.
Darren O'Dea has praised Celtic left back Kieran Tierney.
Ronny Deila's Celtic side are due to meet Mark Warburton's Rangers in the Scottish Cup semi-final.
Southampton signed Virgil van Dijk from Celtic in the summer.
Celtic host Dundee in the Scottish Premiership this evening.
Leeds United were hammered 4-0 by Brighton and Hove Albion this evening.
The defender was not keen on Colin Kazim-Richards when they met on holiday.
The former Bhoys defender has joined the Scottish Premiership side.
The former Celtic and Leeds United centre-back has spoken with a number of teams about a second spell across the Atlantic but "would find it difficult to make a deal work" at present.
Daryl Murphy was amongst the goals once again for Ipswich Town today.