It was feared that Roberts was set for an extended period on the sidelines but he is hopeful of coming through the tests.
"I tackled Gonzalo Tiesii pretty upright and it was probably my fault because it was poor tackle technique," said Roberts.
"His head caught me right on the sweet spot on the jaw which is hard to miss!
"I hope to play against Samoa but I have to go through the protocols where you are tested rigorously. I did mild exercises on Tuesday and will ramp it up on Wednesday.
"I did not suffer any memory loss and the medics have taken good care of me. Hopefully I will be fit for Friday. We will see what will happen on Wednesday morning.
"But I am massively keen to play and you don't need any motivation to play for Wales especially on the back of a defeat to Argentina."
Roberts is well aware of the disappointment of the Welsh public following the defeat to Los Pumas and reckons Friday night's clash provides a shot at redemption.
And he is braced for a ferocious physical onslaught from the big hitting South Sea Islanders.
"Friday will be a huge test for us because we let the Welsh public down and the players are well aware of that," added Roberts.
"We were below par as a team and must redeem ourselves at the next opportunity. We will give it our all. Argentina beat us at home which is hard to take and even harder to admit.
"But international rugby sometimes gives you the chance to make amends very quickly. To have a six-day turnaround and to play against a team like Samoa is a great opportunity to put things right.
"You come up against the likes of Samoa and it is always a great occasion. They are great players who play a wonderful brand of rugby.
"I have huge respect for teams like Samoa. They are big, physical guys and really good rugby players.They wear their hearts on their sleeves and are tough to play.
"We have played them a few times in the last four or five years. In 2009 they would have won if they had not dropped the ball over the line in the last minute. And the match we won in the World Cup last year, it was probably one of the toughest matches of my career.
"We have to be less tactically naive than we were on Saturday when we did not play in the right areas. We have to be on the money from the start of the game, which we were not on Saturday."