The 31-year-old started the USA's Copa America opener against Colombia on Friday over Howard despite enduring a nightmare season at Villa.
Celtic have been linked with both Steven Fletcher and Danny Graham following their releases from Sunderland.
The Arsenal midfielder, who spent this past season on loan at Rangers, has been hailed as one of the US national team's top prospects.
Arsenal are reportedly on the verge of securing the Leicester City star.
The Royals frontman brings the best out of Gareth Bale.
The 57-year-old says he rejected Leeds United 26 years ago, admitting it might not have been the right decision.
Southampton boss Ronald Koeman is reportedly set to complete a move to Everton in the coming days.
West Ham United have already made their first signing of the summer, bringing in Havard Nordtveit from Borussia Monchengladbach.
Glasgow Rangers boss Mark Warburton reportedly wants to bring Steven Taylor to Ibrox, while he has also been linked with Celtic.
The Arsenal hitman scored twice against the Scots in a friendly.