Southampton will try to hijack Scott Sinclair’s move to West Brom after allowing Jason Puncheon to join Crystal Palace on a season’s loan. Puncheon has agreed to link up with Ian Holloway for a third time after playing under the Eagles' manager at Plymouth and Blackpool. Saints are ready to launch a £5million bid for Manchester City wide man Sinclair - whose brother Jake is a member of their Under-21 side. West Brom have agreed a loan deal for the former Swansea ace but the move has been held up because the Manchester heavyweights want the Baggies to commit to buying him next summer. Puncheon - born in Croydon near Palace's south London heartland - only signed a new three-year contract with Saints in March but has fallen out of favour with manager Mauricio Pochettino. The 27-year-old was left out of Pochettino’s squad for Saturday’s Premier League opener - ironically at West Brom. Saints are already the Premier League’s third highest spenders this summer after shelling out a combined £36m to recruit Dejan Lovren Victor Wanyama and Pablo Osvaldo.