Injuries have depleted Scotland's ranks with another Warrior Pat McArthur hobbling out of his debut against Samoa at the weekend.
But having been preparing to begin pre-season with the Warriors - who lost a thrilling RaboDirect PRO12 semi-final to Leinster - Welsh is determined to make his mark on the international set-up.
"I was ready to start pre-season with Glasgow when I got the call to come out, so it was a big surprise," said Welsh, who has one Scotland cap to date.
"But I was ready to go out at the drop of a hat, so I packed up and left the next day.
"Hopefully I get the opportunity to play and show what I can do."
Meanwhile, the Warriors contingent impressed in the Lions' 64-0 victory over a Combined Country XV with Stuart Hogg scoring a try from fly-half and Sean Maitland enhancing his growing international reputation at full-back.
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