Paul Hurst made the 21-year-old right winger his first deadline day signing when he secured the speedster's services from the National League South side.
Shrewsbury were revealed to have paid an undisclosed fee for Eisa, who signed his first-ever professional deal. In a statement on Wealdstone's official website, Marsden revealed how a goals scored clause in Eisa's terms in London meant that the club's 'hands were tied' in any bid to repel Shrews' interest.
It also explained how the club tried to bring back the former semi-pro star, who moved to London from Sudan with his family as a young child, on loan.
The chairman said: "We have been able to secure one of the highest transfer deals in recent times for the club.
“In the final analysis our hands were tied with the release of Abo due to goals scored trigger clause in his contract and we made every attempt to secure a loan back deal but this was not possible despite hard negotiations.
"We are undoubtedly victims of our own success with Abo in one sense, but the deal agreed is an exceptionally good one with very valuable sell-on clauses and other provisions.”
Eisa's move to the pro game follows defender Ciaron Brown, who recently sealed a move from Wealdstone to Cardiff City. The winger's 12 goals in 22 starts has helped his former side sit 12th in the National League South – three divisions below Town.
The youngster was one of five new additions to Hurst's squad in January. He followed defenders Max Lowe and Luke Hendrie and was joined by fellow attackers Nathan Thomas and Sam Jones in an exciting deadline day at Montgomery Waters Meadow.
Eisa, Thomas and Jones are all in contention to make their Shrewsbury debuts at Bristol Rovers tomorrow.
Updated 10:42 - 5 Feb 2018 by Chris Pinn
Article courtesy of the Shropshire Star