The former Hamburg winger, 22, is on trial at Ibrox, as per STV.
A right-sided wide-man of German descent, Shirdel failed to make a single performance for Hamburg’s senior team in the Bundesliga, but he was a frequent performer in their reserve side.
He left the club when his contract expired at the end of last season, and spent time with Premier League side West Ham earlier this year.
A trial period with Sam Allardyce’s men in February did not turn into a permanent deal, and he has been at Ibrox today for head coach Stuart McCall to observe.
Shirdel has been joined on trial by Milos Milovic, a 19-year-old Montenegrin defender who was training with Aberdeen last month and was close to signing a permanent deal.
The club are unable to register any players until the summer, and so any signing would be held off until the beginning of next season, and in the same report McCall has hinted at a potential signing of the duo.
“The two lads are in training with us but there's not much too it,” McCall said. “They are in Britain right now so it's a chance for us to take a look at them and if they do well, the club might take it forward later in the summer.”
As the free transfer deadline has passed, no signing is possible, but the trial periods shows great foresight from McCall if he intends to sign them in the summer. Rather than waiting until the end of the season to rebuild the squad he inherited in his view, the coach is preparing that job already, and has found two young and promising transfer targets available on the free market.