Livingston defender Cammy Kerr thinks "quality" signing Alex Oxlade-Chamberlain improves the Celtic squad massively.
Martin O'Neill's side currently sit third in the Premiership table, one point behind Rangers and three adrift of Hearts but have one more game to play than their rivals.
Oxlade-Chamberlain, who had been without a club since being released by Besiktas in August, arrived on a free transfer on a deal until the end of the season.
The 32-year-old scored his first Celtic goal in stoppage time to secure a 2-1 win over Livingston, ensuring the reigning champions clinched all three points.
Kerr believes the midfielder, who has won three FA Cups with Arsenal, the Champions League, Premier League and League Cup with Liverpool, can help O'Neill's side cross "over the line" come May.
"Celtic have so much possession, they tire you out mentally, physically, probably what they were last night from Stuttgart and they're relentless," Kerr said on the BBC's Scottish Football podcast.
"They just keep going, they have quality players that they've brought in like Alex Oxlade-Chamberlain, who is of real quality, like you talk about a top signing.
"He's a top signing that's going to get, I believe, Celtic over the line at the end of the season."