The striker joined the Saints from Queens Park Rangers in the January transfer window, with Ronald Koeman moving quickly to secure a bargain £4m move.
He made an impressive start to his career at St Mary’s as well, scoring the winning goal in a 1-0 win over Manchester United.
He has previously managed 18 goals in the Premier League as Rangers were relegated last season, and Howe has backed him to prove his England credentials in the remainder of this season.
“I still think he's young enough for England, and I still think the end of this season could be really important for him," he told Sky Sports.
"England aren't blessed with a huge array of strikers to pick from and I still think he's got every chance to get to the Euros. So the end of the season's going to be important for him.”
"It could possibly turn out to be a timely move. From his perspective he's got to stay fit and bang some goals in."
The problem for Austin is that the competition for the forward positions is fierce heading into Euro 2016.
Harry Kane and Jamie Vardy should be certain to go, while Wayne Rooney is on that list should he be able to recover from his recent knee injury in time.
That likely leaves on place for a number of strikers to compete for, with the likes of Danny Welbeck, Daniel Sturridge, Jermain Defoe, Theo Walcott and Austin all potentially in contention.