The Bucks face yet another of their National League North play-off rivals tonight as the Manchester side come to town.
Altrincham are unbeaten in six games and visit the New Bucks Head in the best possible shape after their 7-0 mauling of their mid-table hosts Alfreton on Saturday.
But Cowan says Alty should be concerned about the proposition of facing Telford – who have come through a tricky group of games against Bradford Park Avenue, Blyth Spartans and Chorley unbeaten taking seven points.
Cowan said he watched their 7-0 success and said it was an occasion where everything the Manchester outfit touched went in.
He said: “Altrincham are a very good side but we’re unbeaten in three – they should be concerned about us.
“We’ve taken Leyton Orient, the best team in non-league, right to the wire and are unbeaten against three of the best teams in the league.
“We’re nobody to be sniffed at. I know that because I spoke to Jamie (Vermiglio, Chorley boss) on Saturday and he told me they were concerned about playing us.
“We know Altrincham are a top side and we are still doing our work on them.”
Midfielder Ellis Deeney is available for selection despite his controversial red card at Chorley.
The three-game ban, if not appealed, will begin on Saturday.