Champions League runners-up Borussia Dortmund have completed the signing of Germany midfielder Pascal Gross from Brighton & Hove Albion. Dortmund said on Thursday that Gross signed a two-year contract after passing the medical and was travelling with the team to a pre-season training camp in Switzerland. The transfer fee has been estimated at €7.5 million ($8.1), plus add-ons. Gross, 33, made his Bundesliga debut 2009 with Hoffenheim and last played in the German top flight with Ingolstadt seven years ago. He then moved to Brighton and played 228 Premier League matches. A late bloomer on the i…