Cristiano Ronaldo's late strike sealed Portugal's 2-1 win over Scotland as the 901st goal of the striker's extraordinary career completed a stirring fightback in Sunday's Nations League clash.

Ronaldo had reached 900 career goals with his 131st international strike in Friday's victory over Croatia.

The 39-year-old showed no signs of being sated by that incredible milestone as he came off the bench to lift Portugal to their second successive win in Nations League Group A1.

The Estadio da Luz in Lisbon rose in unison to chant the relentless Al-Nassr forward's name after he struck with two minutes to play.

On his 30th birthday, Manchester United midfielder Bruno Fernandes fired Portugal's second half equaliser after his former Old Trafford team-mate Scott McTominay gave Scotland a surprise early lead. (AFP)