Watford completed the signing of the Werder Bremen centre back on a free transfer.
The 27-year-old has captained Die Werderaner during his time there, so it is something of coup that the Hornets have managed to sign him on a free transfer, in dong so securing their first signing since achieving promotion to the Premier League.
The giant centre back, who can also operate in midfield, has played much of his career in the German Bundesliga, having moved to Werder Bremen from Sturm Graz in 2008, and Watford supporters will be pleased to see that the club haven't let uncertainty over their managerial situation detract from their transfer business.
Prodl has 49 caps for the Austrian national team, and will coincidentally be joined by compatriot Kevin Wimmer in London, with the Cologne defender moving to Tottenham this summer too.
Below are a selection of Twitter comments from football fans reacting to the deal, with the vast majority impressed with the Londoners' transfer business.
Christ, Sebastian Prodl to Watford. Fantastic signing for them, rock solid defender. Should be well suited to the Premier League— Jonny Clark (@JonjoClark14) June 1, 2015
Prodl is a really good signing, especially on a free transfer. Amazing in the air as you'd expect but a very strong defender too. Very happy— Lee Harris (@lee_harris6) June 1, 2015
woooooahhhh we actually signed Prodl that is a bit of a coup— Watford Talk (@WatfordTalk) June 1, 2015
The two biggest signings in the premier league so far have both been Austrian CB's Wimmer for Spurs and Prodl at Watford.— Jamie Payne (@jamiewba96) June 1, 2015
Well chuffed with #watfordfc signing Sebastian Prodl. IMO he's just the kind of experienced top level defender we needed. Very good. COYHs— MacHornet (@macshieldsgaz) June 1, 2015
Watford have gone and bagged themselves a decent defender in Sebastian Prodl. #watfordfc— Jake Sampson (@JakeRSampson) June 1, 2015
Prodl is a hell of a signing for watford!! Wanted him at arsenal a few years ago, class player— jô$hßärñê$ŵ€lsèñ@ér (@ziggaziggaahhhh) June 1, 2015