The 21-year-old goalkeeper is set to link up with the League Two outfit for his first taste of senior football.
When he is in claret and blue, he is Villa's first-choice U21 goalkeeper.
Siegrist began the 2012-13 campaign by joining up with Switzerland's squad for the London Olympic Games, although he was unused during the prestigious tournament.
He reported back to Villa to play a part in the Barclays U21 Premier League campaign.
Although the Basel-born custodian was kept out through injury during the middle part of the season, he was still able to make 13 appearances for Gordon Cowans' side.
It followed on from a productive 2011-12 campaign, which saw Siegrist establish himself as Villa's reserve team keeper and work at close quarters with the first team.
The Switzerland U21 international made 17 appearances in the Barclays Premier Reserve League as Villa stormed to the southern section title.
But, more significantly, Siegrist was brought into the first team fold by goalkeeping coach Terry Gennoe.
It offered Siegrist the opportunity to work with senior keepers Shay Given and Brad Guzan on matchdays as well as on the training field.
He was an integral member of Villa's NextGen Series squad, playing in five of the six group games before suffering disappointment of missing the last eight tie against Marseille with a hand injury.
On the international stage, Siegrist also established himself as a regular member of the Swiss U21 squad having previously represented his national side at U17 and U19 level.
He finished 2012-13 by helping Villa reach the final of the Hong Kong International Soccer Sevens - the third time he had featured in the prestigious competition.
Siegrist made a big impression in the Villa academy ranks as part of the team that finished as runners-up in the FA Youth Cup in 2009-10.
But his finest achievement that season came with Switzerland, who won the World U17 Cup in Nigeria.
Siegrist walked away with the Golden Gloves award for the tournament's top goalkeeper.
Opportunities at Villa were limited for Siegrist in the 2010-11 season, with Andy Marshall and Elliot Parish also vying for the reserve team keeper's jersey.
But the summer proved to be a busy one for the 6ft 4in stopper.
After representing Switzerland in a European U19 qualifier, he got the call to head to Denmark to provide goalkeeping cover for the U21 side in the Euro 2011 finals.