Several reporters have pointed out 2018 third round pick Durbin Feltman potentially could help this year's Red Sox bullpen.

President of baseball operations Dave Dombrowski needs to trade for at least one setup man before the July 31 trade deadline.

But the Red Sox do have some interesting internal options, including Feltman, Ty Buttrey, Travis Lakins and Bobby Poyner.

Buttrey allowed 1 run in June

Buttrey -- who has reached over 100 mph with his fastball -- has allowed just four earned runs in 29 innings (1.24 ERA) while striking out 37 and walking nine since April 30 for Triple-A Pawtucket.

The righty allowed only one run in 15 innings (0.60 ERA) during June. He struck out 21 and walked three.

"Not because you're getting people out at that level means you're ready to pitch at this level," Red Sox manager Alex Cora said recently. "The pitch mix is very important. If you take a look around the league, the best pitchers, they basically go half and half: 50 percent fastballs, 50 percent offspeed pitches. So that's something; we talk about it. Obviously going up in the zone and expanding down in the zone. And there were a few details as far as his windup and stuff that at this level, people were going to pick up."

Lakins still hasn't allowed an earned run

Lakins still hasn't allow an earned run since the Red Sox converted him to a reliever in late May. He has given up one unearned run, three hits and six walks while striking out 14 in 12 outings (12 2/3 innings).

The 24-year-old righty made his first appearance of more than one inning Monday. He pitched 1 2/3 scoreless innings, allowing one hit and one walk. He pitched a perfect inning Thursday.

Lakins -- a sixth round draft selection in 2015 out of Ohio State -- is not on the 40-man roster yet.

"He's 94-97 (mph) with the fastball right now," said Brian Bannister, vice president of pitching development and assistant pitching coach. "He's throwing a nice, short slider at 90 mph. He's always been able to spin the curveball. But being in the bullpen takes the pressure off having to throw the curveball and the changeup for strikes as often.

"He can be much more aggressive and go after hitters," Bannister added. "So not only has the velo ticked up, the slider shape has improved. It's a lot harder and shorter now with late depth. He'll mix the curveball and changeup in occasionally now. But he doesn't have to rely on a four-pitch mix like he did as a starter."

Don't forget about Poyner

Bobby Poyner continues to pitch well at Triple-A Pawtucket. He has a 2.82 ERA, 1.16 WHIP, 23 strikeouts and eight walks in 22 1/3 innings.

The 25-year-old lefty began the season on the Red Sox's 25-man roster. He allowed just two runs in 10 2/3 innings (1.69 ERA).

Feltman hasn't allowed a hit

Feltman, a 2018 third-round pick out of TCU, hurled a perfect inning in Short Season Lowell's 5-2 loss to Connecticut on Thursday.

He has pitched 3 scoreless and hitless innings of relief so far. He hasn't walked anybody and has struck out 5.