Santiago, 27, entered Tuesday night’s start against the
Santiago threw a career-high 149 innings for the Chicago White Sox in 2013 and 141 1/3 innings for the Angels and triple-A Salt Lake in 2014, part of which he spent as a reliever. So Santiago's workload could increase by as much as 45 innings over last season.
Heaney, 24, has thrown a combined 129 2/3 innings for Salt Lake and the Angels this season, and he is also on pace for about 185 innings, which would be about 22 more than the 166 2/3 innings he threw in the minor leagues and for the Miami Marlins last season.
“You have something in back of your mind,” Manager
"We're watching them. It's something you always pay attention to, but to say we're just concerned with it, at this point, we're not. Hopefully it's a moot point. We'll see."
Heaney is still classified as a "prospect," especially when compared to the older Santiago, but he has shown little slippage in eight starts since joining the Angels, pitching to a 5-1 record and 2.45 earned-run average.
His worst start was his last one, when he gave up four runs and 10 hits in 5 2/3 innings against the Baltimore Orioles last Friday night.