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Austin played against Wan-Bissaka and United on Saturday, with the well-travelled forward getting on the scoresheet in a 4-2 friendly win at the Kiyan Prince Foundation Stadium.
Two goals came down Wan-Bissaka's side and Austin believes the former Crystal Palace defender isn't good enough for a side with title ambitions and "can't defend".
"Although Manchester United have signed [Raphael] Varane, their biggest problem is they need a right-back,"
"Aaron Wan-Bissaka is not up to the [required] quality. We played them the other day, and I know it was only a pre-season, but they need to go all out for Kieran Trippier.
"That's who they're crying out for. Aaron Wan-Bissaka can't defend!
"And his final ball is not what a centre-forward wants, it's not what [Edinson] Cavani wants, it's not what [Marcus] Rashford wants. They need to sign Kieran Trippier."
Arsenal legend Ray Parlour chimed in and asked if it was just a rare bad game for the 23-year-old, promptly Austin to reply: "You can always have a bad game, it was just a pre-season friendly.
"With all due respect, if Aaron Wan-Bissaka is your right-back, are Man United going to win Premier Leagues and silverware? I'm not too sure.
"They need to strengthen there, definitely."
England defender Trippier has been heavily linked with a return to the Premier League, with reports indicating he would be open to leaving Atletico Madrid for his boyhood club even after winning La Liga last term.
However, it has been said that United's potential move for Trippier does hinge on the sales of Paul Pogba and Jesse Lingard.
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