Barrow joint-boss Dave Bayliss has criticised his defence after conceding five goals for the second time in three games in Tuesday's 5-2 loss at Grimsby.
Tuesday's slump at Blundell Park followed the 5-1 defeat at Luton earlier this month, taking their tally of goals against to 28 in 15 games.
"That wasn't Sunday league; that's a disrespect to Sunday league players," Bayliss told BBC Radio Cumbria.
"If Grimsby had our back four, we'd have won by nine or 10."
Bayliss continued: "We had an experienced left-back who played in the Scottish Premier League [Gavin Skelton], a left-sided centre half who played in League One [Andrew Nicholas], Adam Quinn who has played for good Conference sides, and Kelvin Lomax who played nearly 100 Football League games.
"The only player I can take out of that is the goalkeeper Danny Hurst, who has done really well, but that back four have really killed us, and that's not good enough.
"We've scored two goals away from home tonight and that takes some doing, we've come away being thumped 5-2 by not a very good side."
Barrow are 13th in Blue Square Bet Premier with six wins and seven defeats from 15 games.