Should he be selected in the final 23, Jenks will join up with the England squad on 2 June, for warm-up matches against the Republic of Ireland and Belarus.
There, England will face group games against Portugal on 18 June, Sweden on 21 June and Italy on 24 June.
The top two in the group will then face a semi-final on 27 June, with the final taking place three days later.
Jenkinson himself has ten U21 caps since making his debut at that level in 2013, having previously represented Finland at youth levels.
Meanwhile, the official site reports Cheikhou Kouyate has been called up for Senegal’s Africa Cup of Nations qualifier against Burundi.