"I'm very happy to be here and I'm very excited" said Bosch.
"My first impression of Saracens is that I'm really impressed with the club."
"I had the opportunity of seeing the match last Friday in Ireland with a few of the players who weren't playing on the night and I really enjoyed it.
"Everyone has been welcoming since I've arrived, they are treating me really well and have been very kind with me."
"It's a good challenge for me. After seven years of living in France and playing in the Top 14 I've made the change to the Premiership and it's great to playing in the Heineken Cup - it's very exciting for me and I'm delighted to be here."
The 29-year-old is ineligible for Saracens crunch Heineken Cup clash with Toulouse at Wembley on Friday night. But he can be added to their European squad ahead of Round Three and the double headers with Zebre.
Bosch has made 29 appearances in ERC competitions and has amassed 41 points during that time.
He was a regular in the Pumas' midfield in the recent Rugby Championship, scoring a try in their defeat to Australia earlier this month.