The most-traded wheat contract on the Chicago Board of Trade (CBOT) Wv1 was 0.6% up at $6.34-3/4 a bushel, as of 1159 GMT, moving away from Thursday's four-week low of $6.26-3/4.
Traders have been weighing disruption to shipments from Russia and Ukraine against large global supply, including in the Black Sea region, and slow demand from importers.
"The grain is there," said Commonwealth Bank analyst Dennis Voznesenski. "The big question now is whether they can get it out. That's the determining factor of whether we see prices go up or down."
On Thursday, the governor of Ukraine's Odesa Region said a Russian attack had damaged a foreign-flagged ship loaded with wheat, killing one crew member and causing a fire.
On Friday, traders said there was more unconfirmed talk of drone attacks at Russia's Black Sea port of Novorossiysk that may have damaged vessels.
"Unless export demand improves or geopolitical disruption intensifies further, ample global grain supplies are likely to limit sustained price gains," British merchant ADM Agriculture said in a note.