The Owls stopper has missed the club's last six games due to a groin injury.
The 31-year-old has not featured for Carlos Carvalhal's side since the emphatic 4-1 victory over Wolves in December, and the Portuguese explained that while the Republic of Ireland international was back in training before the club's most recent game - the Yorkshire derby win against Leeds - he was not quite ready to return.
"Keiren is very near to coming back. He is training with the team but he didn't feel 100 per cent for Leeds so we didn't to take any risks," he told the Star.
While Westwood has missed 10 league games already this season - including the club's most recent five fixtures in the Championship - he has helped the side move into play-off contention this term with a continuation of the form that made him the club's player of the season last campaign.
Despite his absence, Wednesday have managed to maintain their form with five wins from six games in all competitions. Their only defeat in the run came when they travelled to league leaders Middlesbrough.
And with the narrow scoreline from the game at the Riverside Stadium suggesting that the Owls were genuine promotion contenders, Westwood's return may be the factor that sees the club cement their place in the race for a spot in the Premier League.