The Irishman was impressed with Steve Bruce's men at the Amex.
The pair, both playing their club football in the Championship, kept a clean sheet, but Cascarino is still concerned.
The Blackburn Rovers centre-half was linked with a move to Celtic Park earlier this summer.
The Championship side have already made an offer for the Republic of Ireland international this summer.
Shane Duffy's night to forget prompted this reaction from Twitter.
Blackburn lost their third game of the season yesterday away at Cardiff City.
West Bromwich Albion and Sunderland are among the favourites to sign Shane Duffy from Blackburn Rovers, according to Betvictor.com.
Brighton & Hove Albion are reportedly interested in signing Shane Duffy from Blackburn Rovers in the summer transfer window.
Brighton and Hove Albion have been linked with Blackburn Rovers ace Shane Duffy.
The Seagulls are one of a number of clubs reportedly chasing the centre-back's signature.
The Republic of Ireland’s fortitude knows no bounds and there were symbols of it everywhere during their final Euro 2016 Group E tie on Wednesday night, when they defeated Italy 1-0 to record, arguably, their finest victory at a tournament to set up a last-16 meeting with France.
The late comer to the squad will be pushing for a start.
The Blackburn star won more headers in the Championship than any other defender in 2015-16.