Speaking about centurion Biggar, and lock Alun Wyn Jones, who brings up 150 Wales caps this weekend, Wales boss Wayne Pivac said: “Dan and Al are huge players for Wales and have been for many years now.
“We’ve said with other players reaching 100 appearances what an achievement that is and for Dan I know he’s been looking forward to this moment for a long time.
"For him to achieve it with Al, who is also getting the milestone of 150 caps – which no other player has ever done – I think it’s fitting for those two to share the day.
Northampton Town 2 Hartlepool United 1: James Heneghan's player ratings
IN PICTURES: Sam Hoskins' remarkable Cobblers career as he approaches major milestone
Brighton loanee 'made a difference' for Cobblers against Hartlepool as fellow new signing also earns praise after hard-fought win
Opposition view: Hartlepool 'deserved more' from Sixfields clash, claims boss Hartley
Cobblers turned down 'substantial offers' for Guthrie before defender agreed new deal
"They’ve played a lot of rugby together and have a healthy respect for each other.
"They’ve given so much for the game in Wales.”
Courtney Lawes and George Furbank have both been retained, but Alex Mitchell has been released back to Saints.