Pathway development manager Gordon Greer said: “Having broken into the Swiss national squad, Andi is keen to play regular football ahead of this year’s World Cup in Qatar.
“We cannot guarantee him that here, so this move gives him the chance of that, while also continuing his development.
“We wish him well for the new season, and will be monitoring his progress throughout the campaign.”
The Swiss international spent last season on loan in the German Bundesliga with FC Augsburg, where he made 19 appearances, scoring twice.
He joined Albion after a prolific campaign in his homeland, scoring 22 goals in 37 appearances in all competitions, as Lausanne were promoted to the Swiss top-flight.
Check out the latest Premier League transfer speculation below...
1. Telles set for La Liga loan
Manchester United left-back Alex Telles is set to complete a loan move to join Sevilla this week. (Fabrizio Romano)
2. Everton deal for Gueye on track
Everton are reportedly now ‘on track’ to sign Idrissa Gueye, with talks ‘ongoing’ for the midfielder. (Alan Nixon)
3. Vardy attracting interest
Chelsea and Manchester United are monitoring Jamie Vardy’s situation at Leicester City ahead of a potential summer move. (90min)
4. De Tomas price set
Espanyol are willing to take as little as £20.9m for Newcastle United linked striker Raul de Tomas. (Estadio Deportivo)