Middlesbrough have signed Slovakia international forward David Strelec and former Scotland goalkeeper Jon McLaughlin, and have completed a loan move for Sunderland midfielder Alan Browne.
Strelec, who joins on a five-year deal from Slovan Bratislava for an undisclosed fee, has played 30 times for his country, scoring seven goals.
He made 166 appearances in all competitions for his previous club, scoring on 62 occasions, including four times in six games this season.
Strelec also featured in the Uefa Champions League league phase last season, notably finding the net in a defeat at Atletico Madrid.