Just 24 hours since Warren Gatland’s team was released – including four Scots and three from Edinburgh – Watson has been forced out after picking up a concussion in training yesterday. Mandatory protocols mean he will begin a phased return to action after his recovery.
His place in the The Vodafone Lions 1888 Cup match will be taken by Ospreys’ Welsh international Justin Tipuric.
Watson had been selected alongside his club winger Duhan van der Merwe and Rory Sutherland, plus Scotland team-mate Zander Fagerson. Glasgow Warriors’ Ali Price was also among the substitutes in the selection announced on Tuesday.
He was one of eight Scots selected in the squad and hoped to stake a claim for a place in the Lions Test team in South Africa after a strong season. However the loose forward will now begin the graduated return-to-play protocol.