Arsenal star Pierre-Emerick Aubameyang hasn't found the net since penning a new contract at the club over the summer.
And former Liverpool star Stephen Warnock is concerned for the Gunners fan favourite.
Aubameyang held all the cards over the summer as he debated allowing his contract run down this season, as fans begged for his renewal.
But since signing a new deal at the Emirates, the Gabon forward has really struggled for form under Mikel Arteta at home and in Europe.
And Warnock believes Aubameyang's struggles may be down to the fact he isn't hungry to prove his worth anymore after ending his contract saga.
“What I will say is that since Aubameyang signed his contract he hasn’t looked the same sort of player as he did before he signed, a player hungry to prove his worth to suitors,” Warnock told the Daily Express.
“I’m just a little bit concerned about him.
“When you’re entering the final year of your contract you’ve got it all to play for.
“He knew what was at stake and how important he was to the club. He knew the cards were in his hands and he was the one in demand.
“A lot of teams would have snapped your hand off to get him with one year to go or wait for him to walk out on a free.
Arsenal won 3-0 last night, beating Irish side Dundalk in the Europa League.
However, this weekend's opponents Manchester United are riding high after a 5-0 win against RB Leipzig.
"It’s so unpredictable," Warnock said of Sunday's tie between the two sides.
“You look at Arsenal and what they’re capable of, what they’ve shown over the season, they’re more organised and tough to beat.
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“United on the day are a magnificent team. I actually can’t call it.
“You’d say after the games last night that United should comfortably win the game, but you look at Arsenal and the players they have at their disposal...”
Stephen Warnock spoke to Express Sport at the launch of 7 Elite Academy's partnership with Coaching Connexions, which will give players from across the world the opportunity to study and train in Liverpool. For more information visit www.7eliteacademy.com.