Tierney is the son of rugby league icon Jason Robinson, and produced a display of which his famous father would have been proud.
“He was very good – he organised our defence well throughout the game,” said Workington coach Phil Veivers.
“He brought the ball back on his kick returns with interest every time, and created a try for Jack Murphy through his speed and agility.
“He also scored two tries of his own, when he showed electric speed and footwork.”
Tierney also received the award for the Kingstone Press Championship Try of the Week, with his second try against the Cougars being a real gem.
He fielded a kick inside his own in-goal area just three minutes before half time, before beating four Keighley defenders and rounding opposite number James Craven to score.
“That was a pretty special try,” said Phil Veivers.
“He caught Richie Barnett a bit flat-footed in the in-goal, and skipped past him and three others.
“He then stood the full-back up and raced around him to score.”
Meanwhile, the Kingstone Press Performance of the Week award was given to Doncaster, for their 24-16 win at league leaders Leigh Centurions.
Doncaster coach Paul Cooke was delighted by the way the Dons showed such impressive collective spirit.
“I couldn’t be more proud of the group and the way they conducted themselves all week,” he said.
“Eighty per cent of the battle is believing you can beat Leigh before you go out. We knew if we could get to 20 points or so, and defend OK, then we’d be in with a chance.
“It answers some questions on the players’ ability and what they can achieve. They showed some real belief in themselves.”
Kingstone Press Championship Team of the Week
3 Ben Crooks (Doncaster)
4 Jessie Joe Parker (Whitehaven)
5 Craig Calvert (Whitehaven)
6 Lewis Sheridan (Rochdale Hornets)
7 Richard Wilkinson (Doncaster)
9 Andy McClurg (Rochdale Hornets)
10 Luke Ambler (Halifax)